Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/typing_extensions.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1 import abc
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2 import collections
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3 import contextlib
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4 import sys
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5 import typing
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6 import collections.abc as collections_abc
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7 import operator
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8
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9 # These are used by Protocol implementation
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10 # We use internal typing helpers here, but this significantly reduces
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11 # code duplication. (Also this is only until Protocol is in typing.)
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12 from typing import Generic, Callable, TypeVar, Tuple
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13
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14 # After PEP 560, internal typing API was substantially reworked.
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15 # This is especially important for Protocol class which uses internal APIs
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16 # quite extensivelly.
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17 PEP_560 = sys.version_info[:3] >= (3, 7, 0)
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18
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19 if PEP_560:
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20 GenericMeta = TypingMeta = type
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21 else:
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22 from typing import GenericMeta, TypingMeta
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23 OLD_GENERICS = False
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24 try:
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25 from typing import _type_vars, _next_in_mro, _type_check
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26 except ImportError:
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27 OLD_GENERICS = True
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28 try:
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29 from typing import _subs_tree # noqa
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30 SUBS_TREE = True
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31 except ImportError:
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32 SUBS_TREE = False
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33 try:
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34 from typing import _tp_cache
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35 except ImportError:
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36 def _tp_cache(x):
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37 return x
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38 try:
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39 from typing import _TypingEllipsis, _TypingEmpty
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40 except ImportError:
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41 class _TypingEllipsis:
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42 pass
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43
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44 class _TypingEmpty:
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45 pass
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46
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47
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48 # The two functions below are copies of typing internal helpers.
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49 # They are needed by _ProtocolMeta
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50
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51
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52 def _no_slots_copy(dct):
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53 dict_copy = dict(dct)
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54 if '__slots__' in dict_copy:
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55 for slot in dict_copy['__slots__']:
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56 dict_copy.pop(slot, None)
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57 return dict_copy
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58
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59
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60 def _check_generic(cls, parameters):
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61 if not cls.__parameters__:
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62 raise TypeError("%s is not a generic class" % repr(cls))
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63 alen = len(parameters)
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64 elen = len(cls.__parameters__)
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65 if alen != elen:
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66 raise TypeError("Too %s parameters for %s; actual %s, expected %s" %
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67 ("many" if alen > elen else "few", repr(cls), alen, elen))
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68
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69
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70 if hasattr(typing, '_generic_new'):
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71 _generic_new = typing._generic_new
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72 else:
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73 # Note: The '_generic_new(...)' function is used as a part of the
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74 # process of creating a generic type and was added to the typing module
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75 # as of Python 3.5.3.
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76 #
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77 # We've defined '_generic_new(...)' below to exactly match the behavior
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78 # implemented in older versions of 'typing' bundled with Python 3.5.0 to
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79 # 3.5.2. This helps eliminate redundancy when defining collection types
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80 # like 'Deque' later.
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81 #
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82 # See https://github.com/python/typing/pull/308 for more details -- in
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83 # particular, compare and contrast the definition of types like
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84 # 'typing.List' before and after the merge.
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85
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86 def _generic_new(base_cls, cls, *args, **kwargs):
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87 return base_cls.__new__(cls, *args, **kwargs)
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88
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89 # See https://github.com/python/typing/pull/439
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90 if hasattr(typing, '_geqv'):
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91 from typing import _geqv
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92 _geqv_defined = True
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93 else:
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94 _geqv = None
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95 _geqv_defined = False
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96
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97 if sys.version_info[:2] >= (3, 6):
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98 import _collections_abc
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99 _check_methods_in_mro = _collections_abc._check_methods
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100 else:
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101 def _check_methods_in_mro(C, *methods):
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102 mro = C.__mro__
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103 for method in methods:
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104 for B in mro:
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105 if method in B.__dict__:
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106 if B.__dict__[method] is None:
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107 return NotImplemented
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108 break
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109 else:
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110 return NotImplemented
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111 return True
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112
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113
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114 # Please keep __all__ alphabetized within each category.
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115 __all__ = [
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116 # Super-special typing primitives.
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117 'ClassVar',
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118 'Final',
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119 'Type',
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120
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121 # ABCs (from collections.abc).
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122 # The following are added depending on presence
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123 # of their non-generic counterparts in stdlib:
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124 # 'Awaitable',
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125 # 'AsyncIterator',
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126 # 'AsyncIterable',
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127 # 'Coroutine',
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128 # 'AsyncGenerator',
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129 # 'AsyncContextManager',
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130 # 'ChainMap',
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131
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132 # Concrete collection types.
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133 'ContextManager',
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134 'Counter',
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135 'Deque',
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136 'DefaultDict',
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137 'TypedDict',
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138
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139 # One-off things.
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140 'final',
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141 'IntVar',
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142 'Literal',
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143 'NewType',
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144 'overload',
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145 'Text',
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146 'TYPE_CHECKING',
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147 ]
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148
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149 # Annotated relies on substitution trees of pep 560. It will not work for
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150 # versions of typing older than 3.5.3
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151 HAVE_ANNOTATED = PEP_560 or SUBS_TREE
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152
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153 if PEP_560:
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154 __all__.extend(["get_args", "get_origin", "get_type_hints"])
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155
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156 if HAVE_ANNOTATED:
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157 __all__.append("Annotated")
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158
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159 # Protocols are hard to backport to the original version of typing 3.5.0
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160 HAVE_PROTOCOLS = sys.version_info[:3] != (3, 5, 0)
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161
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162 if HAVE_PROTOCOLS:
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163 __all__.extend(['Protocol', 'runtime', 'runtime_checkable'])
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164
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165
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166 # TODO
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167 if hasattr(typing, 'NoReturn'):
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168 NoReturn = typing.NoReturn
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169 elif hasattr(typing, '_FinalTypingBase'):
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170 class _NoReturn(typing._FinalTypingBase, _root=True):
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171 """Special type indicating functions that never return.
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172 Example::
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173
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174 from typing import NoReturn
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175
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176 def stop() -> NoReturn:
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177 raise Exception('no way')
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178
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179 This type is invalid in other positions, e.g., ``List[NoReturn]``
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180 will fail in static type checkers.
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181 """
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182 __slots__ = ()
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183
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184 def __instancecheck__(self, obj):
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185 raise TypeError("NoReturn cannot be used with isinstance().")
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186
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187 def __subclasscheck__(self, cls):
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188 raise TypeError("NoReturn cannot be used with issubclass().")
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189
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190 NoReturn = _NoReturn(_root=True)
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191 else:
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192 class _NoReturnMeta(typing.TypingMeta):
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193 """Metaclass for NoReturn"""
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194 def __new__(cls, name, bases, namespace, _root=False):
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195 return super().__new__(cls, name, bases, namespace, _root=_root)
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196
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197 def __instancecheck__(self, obj):
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198 raise TypeError("NoReturn cannot be used with isinstance().")
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199
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200 def __subclasscheck__(self, cls):
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201 raise TypeError("NoReturn cannot be used with issubclass().")
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202
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203 class NoReturn(typing.Final, metaclass=_NoReturnMeta, _root=True):
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204 """Special type indicating functions that never return.
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205 Example::
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206
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207 from typing import NoReturn
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208
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209 def stop() -> NoReturn:
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210 raise Exception('no way')
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211
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212 This type is invalid in other positions, e.g., ``List[NoReturn]``
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213 will fail in static type checkers.
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214 """
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215 __slots__ = ()
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216
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217
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218 # Some unconstrained type variables. These are used by the container types.
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219 # (These are not for export.)
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220 T = typing.TypeVar('T') # Any type.
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221 KT = typing.TypeVar('KT') # Key type.
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222 VT = typing.TypeVar('VT') # Value type.
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223 T_co = typing.TypeVar('T_co', covariant=True) # Any type covariant containers.
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224 V_co = typing.TypeVar('V_co', covariant=True) # Any type covariant containers.
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225 VT_co = typing.TypeVar('VT_co', covariant=True) # Value type covariant containers.
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226 T_contra = typing.TypeVar('T_contra', contravariant=True) # Ditto contravariant.
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227
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228
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229 if hasattr(typing, 'ClassVar'):
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230 ClassVar = typing.ClassVar
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231 elif hasattr(typing, '_FinalTypingBase'):
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232 class _ClassVar(typing._FinalTypingBase, _root=True):
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233 """Special type construct to mark class variables.
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234
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235 An annotation wrapped in ClassVar indicates that a given
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236 attribute is intended to be used as a class variable and
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237 should not be set on instances of that class. Usage::
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238
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239 class Starship:
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240 stats: ClassVar[Dict[str, int]] = {} # class variable
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241 damage: int = 10 # instance variable
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242
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243 ClassVar accepts only types and cannot be further subscribed.
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244
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245 Note that ClassVar is not a class itself, and should not
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246 be used with isinstance() or issubclass().
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247 """
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248
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249 __slots__ = ('__type__',)
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250
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251 def __init__(self, tp=None, **kwds):
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252 self.__type__ = tp
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253
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254 def __getitem__(self, item):
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255 cls = type(self)
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256 if self.__type__ is None:
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257 return cls(typing._type_check(item,
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258 '{} accepts only single type.'.format(cls.__name__[1:])),
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259 _root=True)
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260 raise TypeError('{} cannot be further subscripted'
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261 .format(cls.__name__[1:]))
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262
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263 def _eval_type(self, globalns, localns):
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264 new_tp = typing._eval_type(self.__type__, globalns, localns)
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265 if new_tp == self.__type__:
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266 return self
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267 return type(self)(new_tp, _root=True)
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268
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269 def __repr__(self):
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270 r = super().__repr__()
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271 if self.__type__ is not None:
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272 r += '[{}]'.format(typing._type_repr(self.__type__))
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273 return r
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274
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275 def __hash__(self):
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276 return hash((type(self).__name__, self.__type__))
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277
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278 def __eq__(self, other):
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279 if not isinstance(other, _ClassVar):
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280 return NotImplemented
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281 if self.__type__ is not None:
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282 return self.__type__ == other.__type__
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283 return self is other
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284
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285 ClassVar = _ClassVar(_root=True)
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286 else:
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287 class _ClassVarMeta(typing.TypingMeta):
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288 """Metaclass for ClassVar"""
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289
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290 def __new__(cls, name, bases, namespace, tp=None, _root=False):
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291 self = super().__new__(cls, name, bases, namespace, _root=_root)
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292 if tp is not None:
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293 self.__type__ = tp
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294 return self
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295
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296 def __instancecheck__(self, obj):
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297 raise TypeError("ClassVar cannot be used with isinstance().")
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298
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299 def __subclasscheck__(self, cls):
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300 raise TypeError("ClassVar cannot be used with issubclass().")
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301
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302 def __getitem__(self, item):
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303 cls = type(self)
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304 if self.__type__ is not None:
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305 raise TypeError('{} cannot be further subscripted'
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306 .format(cls.__name__[1:]))
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307
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308 param = typing._type_check(
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309 item,
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310 '{} accepts only single type.'.format(cls.__name__[1:]))
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311 return cls(self.__name__, self.__bases__,
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312 dict(self.__dict__), tp=param, _root=True)
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313
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314 def _eval_type(self, globalns, localns):
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315 new_tp = typing._eval_type(self.__type__, globalns, localns)
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316 if new_tp == self.__type__:
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317 return self
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318 return type(self)(self.__name__, self.__bases__,
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319 dict(self.__dict__), tp=self.__type__,
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320 _root=True)
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321
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322 def __repr__(self):
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323 r = super().__repr__()
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324 if self.__type__ is not None:
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325 r += '[{}]'.format(typing._type_repr(self.__type__))
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326 return r
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327
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328 def __hash__(self):
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329 return hash((type(self).__name__, self.__type__))
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330
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331 def __eq__(self, other):
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332 if not isinstance(other, ClassVar):
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333 return NotImplemented
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334 if self.__type__ is not None:
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335 return self.__type__ == other.__type__
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336 return self is other
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337
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338 class ClassVar(typing.Final, metaclass=_ClassVarMeta, _root=True):
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339 """Special type construct to mark class variables.
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340
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341 An annotation wrapped in ClassVar indicates that a given
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342 attribute is intended to be used as a class variable and
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343 should not be set on instances of that class. Usage::
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344
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345 class Starship:
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346 stats: ClassVar[Dict[str, int]] = {} # class variable
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347 damage: int = 10 # instance variable
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348
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349 ClassVar accepts only types and cannot be further subscribed.
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350
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351 Note that ClassVar is not a class itself, and should not
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352 be used with isinstance() or issubclass().
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353 """
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354
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355 __type__ = None
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356
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357 # On older versions of typing there is an internal class named "Final".
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358 if hasattr(typing, 'Final') and sys.version_info[:2] >= (3, 7):
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359 Final = typing.Final
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360 elif sys.version_info[:2] >= (3, 7):
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361 class _FinalForm(typing._SpecialForm, _root=True):
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362
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363 def __repr__(self):
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364 return 'typing_extensions.' + self._name
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365
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366 def __getitem__(self, parameters):
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367 item = typing._type_check(parameters,
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368 '{} accepts only single type'.format(self._name))
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369 return _GenericAlias(self, (item,))
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370
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371 Final = _FinalForm('Final',
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372 doc="""A special typing construct to indicate that a name
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373 cannot be re-assigned or overridden in a subclass.
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374 For example:
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375
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376 MAX_SIZE: Final = 9000
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377 MAX_SIZE += 1 # Error reported by type checker
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378
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379 class Connection:
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380 TIMEOUT: Final[int] = 10
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381 class FastConnector(Connection):
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382 TIMEOUT = 1 # Error reported by type checker
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383
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384 There is no runtime checking of these properties.""")
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385 elif hasattr(typing, '_FinalTypingBase'):
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386 class _Final(typing._FinalTypingBase, _root=True):
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387 """A special typing construct to indicate that a name
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388 cannot be re-assigned or overridden in a subclass.
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389 For example:
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390
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391 MAX_SIZE: Final = 9000
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392 MAX_SIZE += 1 # Error reported by type checker
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393
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394 class Connection:
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395 TIMEOUT: Final[int] = 10
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396 class FastConnector(Connection):
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397 TIMEOUT = 1 # Error reported by type checker
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398
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399 There is no runtime checking of these properties.
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400 """
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401
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402 __slots__ = ('__type__',)
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403
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404 def __init__(self, tp=None, **kwds):
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405 self.__type__ = tp
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406
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407 def __getitem__(self, item):
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408 cls = type(self)
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409 if self.__type__ is None:
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410 return cls(typing._type_check(item,
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411 '{} accepts only single type.'.format(cls.__name__[1:])),
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412 _root=True)
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413 raise TypeError('{} cannot be further subscripted'
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414 .format(cls.__name__[1:]))
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415
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416 def _eval_type(self, globalns, localns):
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417 new_tp = typing._eval_type(self.__type__, globalns, localns)
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418 if new_tp == self.__type__:
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419 return self
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420 return type(self)(new_tp, _root=True)
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421
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422 def __repr__(self):
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423 r = super().__repr__()
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424 if self.__type__ is not None:
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425 r += '[{}]'.format(typing._type_repr(self.__type__))
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426 return r
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427
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428 def __hash__(self):
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429 return hash((type(self).__name__, self.__type__))
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430
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431 def __eq__(self, other):
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432 if not isinstance(other, _Final):
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433 return NotImplemented
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434 if self.__type__ is not None:
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435 return self.__type__ == other.__type__
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436 return self is other
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437
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438 Final = _Final(_root=True)
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439 else:
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440 class _FinalMeta(typing.TypingMeta):
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441 """Metaclass for Final"""
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442
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443 def __new__(cls, name, bases, namespace, tp=None, _root=False):
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444 self = super().__new__(cls, name, bases, namespace, _root=_root)
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445 if tp is not None:
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446 self.__type__ = tp
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447 return self
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448
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449 def __instancecheck__(self, obj):
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450 raise TypeError("Final cannot be used with isinstance().")
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451
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452 def __subclasscheck__(self, cls):
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453 raise TypeError("Final cannot be used with issubclass().")
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454
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455 def __getitem__(self, item):
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456 cls = type(self)
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457 if self.__type__ is not None:
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458 raise TypeError('{} cannot be further subscripted'
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459 .format(cls.__name__[1:]))
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460
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461 param = typing._type_check(
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462 item,
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463 '{} accepts only single type.'.format(cls.__name__[1:]))
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464 return cls(self.__name__, self.__bases__,
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465 dict(self.__dict__), tp=param, _root=True)
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466
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467 def _eval_type(self, globalns, localns):
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468 new_tp = typing._eval_type(self.__type__, globalns, localns)
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469 if new_tp == self.__type__:
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470 return self
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471 return type(self)(self.__name__, self.__bases__,
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472 dict(self.__dict__), tp=self.__type__,
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473 _root=True)
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474
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475 def __repr__(self):
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476 r = super().__repr__()
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477 if self.__type__ is not None:
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478 r += '[{}]'.format(typing._type_repr(self.__type__))
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479 return r
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480
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481 def __hash__(self):
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482 return hash((type(self).__name__, self.__type__))
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483
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484 def __eq__(self, other):
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485 if not isinstance(other, Final):
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486 return NotImplemented
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487 if self.__type__ is not None:
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488 return self.__type__ == other.__type__
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489 return self is other
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490
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491 class Final(typing.Final, metaclass=_FinalMeta, _root=True):
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492 """A special typing construct to indicate that a name
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493 cannot be re-assigned or overridden in a subclass.
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494 For example:
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495
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496 MAX_SIZE: Final = 9000
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497 MAX_SIZE += 1 # Error reported by type checker
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498
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499 class Connection:
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500 TIMEOUT: Final[int] = 10
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501 class FastConnector(Connection):
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502 TIMEOUT = 1 # Error reported by type checker
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503
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504 There is no runtime checking of these properties.
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505 """
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506
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507 __type__ = None
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508
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509
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510 if hasattr(typing, 'final'):
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511 final = typing.final
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512 else:
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513 def final(f):
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514 """This decorator can be used to indicate to type checkers that
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515 the decorated method cannot be overridden, and decorated class
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516 cannot be subclassed. For example:
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517
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518 class Base:
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519 @final
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520 def done(self) -> None:
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521 ...
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522 class Sub(Base):
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523 def done(self) -> None: # Error reported by type checker
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524 ...
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525 @final
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526 class Leaf:
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527 ...
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528 class Other(Leaf): # Error reported by type checker
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529 ...
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530
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531 There is no runtime checking of these properties.
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532 """
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533 return f
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534
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535
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536 def IntVar(name):
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537 return TypeVar(name)
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538
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539
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540 if hasattr(typing, 'Literal'):
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541 Literal = typing.Literal
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542 elif sys.version_info[:2] >= (3, 7):
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543 class _LiteralForm(typing._SpecialForm, _root=True):
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544
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545 def __repr__(self):
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546 return 'typing_extensions.' + self._name
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547
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548 def __getitem__(self, parameters):
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549 return _GenericAlias(self, parameters)
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550
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551 Literal = _LiteralForm('Literal',
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552 doc="""A type that can be used to indicate to type checkers
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553 that the corresponding value has a value literally equivalent
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554 to the provided parameter. For example:
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555
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556 var: Literal[4] = 4
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557
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558 The type checker understands that 'var' is literally equal to
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559 the value 4 and no other value.
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560
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561 Literal[...] cannot be subclassed. There is no runtime
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562 checking verifying that the parameter is actually a value
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563 instead of a type.""")
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564 elif hasattr(typing, '_FinalTypingBase'):
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565 class _Literal(typing._FinalTypingBase, _root=True):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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566 """A type that can be used to indicate to type checkers that the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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567 corresponding value has a value literally equivalent to the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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568 provided parameter. For example:
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569
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570 var: Literal[4] = 4
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571
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572 The type checker understands that 'var' is literally equal to the
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573 value 4 and no other value.
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574
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575 Literal[...] cannot be subclassed. There is no runtime checking
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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576 verifying that the parameter is actually a value instead of a type.
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577 """
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578
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579 __slots__ = ('__values__',)
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580
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581 def __init__(self, values=None, **kwds):
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582 self.__values__ = values
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583
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584 def __getitem__(self, values):
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585 cls = type(self)
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586 if self.__values__ is None:
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587 if not isinstance(values, tuple):
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588 values = (values,)
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589 return cls(values, _root=True)
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590 raise TypeError('{} cannot be further subscripted'
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591 .format(cls.__name__[1:]))
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592
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593 def _eval_type(self, globalns, localns):
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594 return self
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595
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596 def __repr__(self):
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597 r = super().__repr__()
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598 if self.__values__ is not None:
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599 r += '[{}]'.format(', '.join(map(typing._type_repr, self.__values__)))
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600 return r
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601
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602 def __hash__(self):
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603 return hash((type(self).__name__, self.__values__))
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604
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605 def __eq__(self, other):
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606 if not isinstance(other, _Literal):
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607 return NotImplemented
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608 if self.__values__ is not None:
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609 return self.__values__ == other.__values__
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610 return self is other
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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611
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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612 Literal = _Literal(_root=True)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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613 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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614 class _LiteralMeta(typing.TypingMeta):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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615 """Metaclass for Literal"""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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616
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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617 def __new__(cls, name, bases, namespace, values=None, _root=False):
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618 self = super().__new__(cls, name, bases, namespace, _root=_root)
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619 if values is not None:
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620 self.__values__ = values
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621 return self
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622
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623 def __instancecheck__(self, obj):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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624 raise TypeError("Literal cannot be used with isinstance().")
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625
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626 def __subclasscheck__(self, cls):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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627 raise TypeError("Literal cannot be used with issubclass().")
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628
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629 def __getitem__(self, item):
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630 cls = type(self)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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631 if self.__values__ is not None:
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632 raise TypeError('{} cannot be further subscripted'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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633 .format(cls.__name__[1:]))
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634
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635 if not isinstance(item, tuple):
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636 item = (item,)
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637 return cls(self.__name__, self.__bases__,
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638 dict(self.__dict__), values=item, _root=True)
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639
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640 def _eval_type(self, globalns, localns):
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641 return self
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642
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643 def __repr__(self):
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644 r = super().__repr__()
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645 if self.__values__ is not None:
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646 r += '[{}]'.format(', '.join(map(typing._type_repr, self.__values__)))
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647 return r
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648
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649 def __hash__(self):
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650 return hash((type(self).__name__, self.__values__))
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651
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652 def __eq__(self, other):
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653 if not isinstance(other, Literal):
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654 return NotImplemented
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655 if self.__values__ is not None:
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656 return self.__values__ == other.__values__
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657 return self is other
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658
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659 class Literal(typing.Final, metaclass=_LiteralMeta, _root=True):
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660 """A type that can be used to indicate to type checkers that the
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661 corresponding value has a value literally equivalent to the
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662 provided parameter. For example:
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663
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664 var: Literal[4] = 4
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665
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666 The type checker understands that 'var' is literally equal to the
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667 value 4 and no other value.
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668
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669 Literal[...] cannot be subclassed. There is no runtime checking
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670 verifying that the parameter is actually a value instead of a type.
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671 """
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672
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673 __values__ = None
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674
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675
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676 def _overload_dummy(*args, **kwds):
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677 """Helper for @overload to raise when called."""
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678 raise NotImplementedError(
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679 "You should not call an overloaded function. "
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680 "A series of @overload-decorated functions "
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681 "outside a stub module should always be followed "
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682 "by an implementation that is not @overload-ed.")
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683
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684
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685 def overload(func):
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686 """Decorator for overloaded functions/methods.
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687
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688 In a stub file, place two or more stub definitions for the same
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689 function in a row, each decorated with @overload. For example:
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690
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691 @overload
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692 def utf8(value: None) -> None: ...
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693 @overload
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694 def utf8(value: bytes) -> bytes: ...
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695 @overload
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696 def utf8(value: str) -> bytes: ...
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697
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698 In a non-stub file (i.e. a regular .py file), do the same but
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699 follow it with an implementation. The implementation should *not*
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700 be decorated with @overload. For example:
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701
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702 @overload
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703 def utf8(value: None) -> None: ...
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704 @overload
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705 def utf8(value: bytes) -> bytes: ...
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706 @overload
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707 def utf8(value: str) -> bytes: ...
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708 def utf8(value):
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709 # implementation goes here
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710 """
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711 return _overload_dummy
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712
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713
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diff changeset
714 # This is not a real generic class. Don't use outside annotations.
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diff changeset
715 if hasattr(typing, 'Type'):
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diff changeset
716 Type = typing.Type
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717 else:
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diff changeset
718 # Internal type variable used for Type[].
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diff changeset
719 CT_co = typing.TypeVar('CT_co', covariant=True, bound=type)
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720
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721 class Type(typing.Generic[CT_co], extra=type):
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diff changeset
722 """A special construct usable to annotate class objects.
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723
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724 For example, suppose we have the following classes::
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diff changeset
725
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726 class User: ... # Abstract base for User classes
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diff changeset
727 class BasicUser(User): ...
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728 class ProUser(User): ...
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diff changeset
729 class TeamUser(User): ...
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730
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731 And a function that takes a class argument that's a subclass of
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732 User and returns an instance of the corresponding class::
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733
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734 U = TypeVar('U', bound=User)
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735 def new_user(user_class: Type[U]) -> U:
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diff changeset
736 user = user_class()
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diff changeset
737 # (Here we could write the user object to a database)
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diff changeset
738 return user
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diff changeset
739 joe = new_user(BasicUser)
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diff changeset
740
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741 At this point the type checker knows that joe has type BasicUser.
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742 """
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743
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744 __slots__ = ()
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745
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746
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diff changeset
747 # Various ABCs mimicking those in collections.abc.
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diff changeset
748 # A few are simply re-exported for completeness.
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749
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750 def _define_guard(type_name):
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751 """
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752 Returns True if the given type isn't defined in typing but
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753 is defined in collections_abc.
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754
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755 Adds the type to __all__ if the collection is found in either
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756 typing or collection_abc.
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757 """
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758 if hasattr(typing, type_name):
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759 __all__.append(type_name)
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760 globals()[type_name] = getattr(typing, type_name)
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761 return False
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762 elif hasattr(collections_abc, type_name):
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763 __all__.append(type_name)
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764 return True
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765 else:
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766 return False
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767
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768
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769 class _ExtensionsGenericMeta(GenericMeta):
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770 def __subclasscheck__(self, subclass):
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771 """This mimics a more modern GenericMeta.__subclasscheck__() logic
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diff changeset
772 (that does not have problems with recursion) to work around interactions
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773 between collections, typing, and typing_extensions on older
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774 versions of Python, see https://github.com/python/typing/issues/501.
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775 """
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776 if sys.version_info[:3] >= (3, 5, 3) or sys.version_info[:3] < (3, 5, 0):
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777 if self.__origin__ is not None:
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778 if sys._getframe(1).f_globals['__name__'] not in ['abc', 'functools']:
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779 raise TypeError("Parameterized generics cannot be used with class "
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diff changeset
780 "or instance checks")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
781 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
782 if not self.__extra__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
783 return super().__subclasscheck__(subclass)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
784 res = self.__extra__.__subclasshook__(subclass)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
785 if res is not NotImplemented:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
786 return res
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
787 if self.__extra__ in subclass.__mro__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
788 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
789 for scls in self.__extra__.__subclasses__():
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
790 if isinstance(scls, GenericMeta):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
791 continue
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
792 if issubclass(subclass, scls):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
793 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
794 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
795
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
796
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
797 if _define_guard('Awaitable'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
798 class Awaitable(typing.Generic[T_co], metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
799 extra=collections_abc.Awaitable):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
800 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
801
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
802
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
803 if _define_guard('Coroutine'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
804 class Coroutine(Awaitable[V_co], typing.Generic[T_co, T_contra, V_co],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
805 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
806 extra=collections_abc.Coroutine):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
807 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
808
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
809
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
810 if _define_guard('AsyncIterable'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
811 class AsyncIterable(typing.Generic[T_co],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
812 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
813 extra=collections_abc.AsyncIterable):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
814 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
815
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
816
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
817 if _define_guard('AsyncIterator'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
818 class AsyncIterator(AsyncIterable[T_co],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
819 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
820 extra=collections_abc.AsyncIterator):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
821 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
822
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
823
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
824 if hasattr(typing, 'Deque'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
825 Deque = typing.Deque
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
826 elif _geqv_defined:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
827 class Deque(collections.deque, typing.MutableSequence[T],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
828 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
829 extra=collections.deque):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
830 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
831
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
832 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
833 if _geqv(cls, Deque):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
834 return collections.deque(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
835 return _generic_new(collections.deque, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
836 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
837 class Deque(collections.deque, typing.MutableSequence[T],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
838 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
839 extra=collections.deque):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
840 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
841
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
842 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
843 if cls._gorg is Deque:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
844 return collections.deque(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
845 return _generic_new(collections.deque, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
846
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
847
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
848 if hasattr(typing, 'ContextManager'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
849 ContextManager = typing.ContextManager
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
850 elif hasattr(contextlib, 'AbstractContextManager'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
851 class ContextManager(typing.Generic[T_co],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
852 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
853 extra=contextlib.AbstractContextManager):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
854 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
855 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
856 class ContextManager(typing.Generic[T_co]):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
857 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
858
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
859 def __enter__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
860 return self
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
861
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
862 @abc.abstractmethod
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
863 def __exit__(self, exc_type, exc_value, traceback):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
864 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
865
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
866 @classmethod
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
867 def __subclasshook__(cls, C):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
868 if cls is ContextManager:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
869 # In Python 3.6+, it is possible to set a method to None to
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
870 # explicitly indicate that the class does not implement an ABC
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
871 # (https://bugs.python.org/issue25958), but we do not support
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
872 # that pattern here because this fallback class is only used
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
873 # in Python 3.5 and earlier.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
874 if (any("__enter__" in B.__dict__ for B in C.__mro__) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
875 any("__exit__" in B.__dict__ for B in C.__mro__)):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
876 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
877 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
878
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
879
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
880 if hasattr(typing, 'AsyncContextManager'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
881 AsyncContextManager = typing.AsyncContextManager
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
882 __all__.append('AsyncContextManager')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
883 elif hasattr(contextlib, 'AbstractAsyncContextManager'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
884 class AsyncContextManager(typing.Generic[T_co],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
885 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
886 extra=contextlib.AbstractAsyncContextManager):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
887 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
888
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
889 __all__.append('AsyncContextManager')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
890 elif sys.version_info[:2] >= (3, 5):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
891 exec("""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
892 class AsyncContextManager(typing.Generic[T_co]):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
893 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
894
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
895 async def __aenter__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
896 return self
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
897
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
898 @abc.abstractmethod
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
899 async def __aexit__(self, exc_type, exc_value, traceback):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
900 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
901
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
902 @classmethod
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
903 def __subclasshook__(cls, C):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
904 if cls is AsyncContextManager:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
905 return _check_methods_in_mro(C, "__aenter__", "__aexit__")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
906 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
907
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
908 __all__.append('AsyncContextManager')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
909 """)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
910
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
911
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
912 if hasattr(typing, 'DefaultDict'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
913 DefaultDict = typing.DefaultDict
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
914 elif _geqv_defined:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
915 class DefaultDict(collections.defaultdict, typing.MutableMapping[KT, VT],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
916 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
917 extra=collections.defaultdict):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
918
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
919 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
920
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
921 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
922 if _geqv(cls, DefaultDict):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
923 return collections.defaultdict(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
924 return _generic_new(collections.defaultdict, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
925 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
926 class DefaultDict(collections.defaultdict, typing.MutableMapping[KT, VT],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
927 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
928 extra=collections.defaultdict):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
929
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
930 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
931
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
932 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
933 if cls._gorg is DefaultDict:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
934 return collections.defaultdict(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
935 return _generic_new(collections.defaultdict, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
936
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
937
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
938 if hasattr(typing, 'Counter'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
939 Counter = typing.Counter
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
940 elif (3, 5, 0) <= sys.version_info[:3] <= (3, 5, 1):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
941 assert _geqv_defined
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
942 _TInt = typing.TypeVar('_TInt')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
943
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
944 class _CounterMeta(typing.GenericMeta):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
945 """Metaclass for Counter"""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
946 def __getitem__(self, item):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
947 return super().__getitem__((item, int))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
948
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
949 class Counter(collections.Counter,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
950 typing.Dict[T, int],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
951 metaclass=_CounterMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
952 extra=collections.Counter):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
953
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
954 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
955
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
956 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
957 if _geqv(cls, Counter):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
958 return collections.Counter(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
959 return _generic_new(collections.Counter, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
960
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
961 elif _geqv_defined:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
962 class Counter(collections.Counter,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
963 typing.Dict[T, int],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
964 metaclass=_ExtensionsGenericMeta, extra=collections.Counter):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
965
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
966 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
967
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
968 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
969 if _geqv(cls, Counter):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
970 return collections.Counter(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
971 return _generic_new(collections.Counter, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
972
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
973 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
974 class Counter(collections.Counter,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
975 typing.Dict[T, int],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
976 metaclass=_ExtensionsGenericMeta, extra=collections.Counter):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
977
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
978 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
979
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
980 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
981 if cls._gorg is Counter:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
982 return collections.Counter(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
983 return _generic_new(collections.Counter, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
984
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
985
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
986 if hasattr(typing, 'ChainMap'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
987 ChainMap = typing.ChainMap
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
988 __all__.append('ChainMap')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
989 elif hasattr(collections, 'ChainMap'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
990 # ChainMap only exists in 3.3+
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
991 if _geqv_defined:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
992 class ChainMap(collections.ChainMap, typing.MutableMapping[KT, VT],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
993 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
994 extra=collections.ChainMap):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
995
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
996 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
997
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
998 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
999 if _geqv(cls, ChainMap):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1000 return collections.ChainMap(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1001 return _generic_new(collections.ChainMap, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1002 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1003 class ChainMap(collections.ChainMap, typing.MutableMapping[KT, VT],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1004 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1005 extra=collections.ChainMap):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1006
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1007 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1008
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1009 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1010 if cls._gorg is ChainMap:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1011 return collections.ChainMap(*args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1012 return _generic_new(collections.ChainMap, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1013
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1014 __all__.append('ChainMap')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1015
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1016
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1017 if _define_guard('AsyncGenerator'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1018 class AsyncGenerator(AsyncIterator[T_co], typing.Generic[T_co, T_contra],
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1019 metaclass=_ExtensionsGenericMeta,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1020 extra=collections_abc.AsyncGenerator):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1021 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1022
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1023
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1024 if hasattr(typing, 'NewType'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1025 NewType = typing.NewType
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1026 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1027 def NewType(name, tp):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1028 """NewType creates simple unique types with almost zero
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1029 runtime overhead. NewType(name, tp) is considered a subtype of tp
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1030 by static type checkers. At runtime, NewType(name, tp) returns
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1031 a dummy function that simply returns its argument. Usage::
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1032
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1033 UserId = NewType('UserId', int)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1034
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1035 def name_by_id(user_id: UserId) -> str:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1036 ...
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1037
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parents:
diff changeset
1038 UserId('user') # Fails type check
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parents:
diff changeset
1039
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parents:
diff changeset
1040 name_by_id(42) # Fails type check
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parents:
diff changeset
1041 name_by_id(UserId(42)) # OK
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parents:
diff changeset
1042
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parents:
diff changeset
1043 num = UserId(5) + 1 # type: int
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parents:
diff changeset
1044 """
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parents:
diff changeset
1045
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parents:
diff changeset
1046 def new_type(x):
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parents:
diff changeset
1047 return x
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parents:
diff changeset
1048
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parents:
diff changeset
1049 new_type.__name__ = name
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parents:
diff changeset
1050 new_type.__supertype__ = tp
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parents:
diff changeset
1051 return new_type
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parents:
diff changeset
1052
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parents:
diff changeset
1053
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parents:
diff changeset
1054 if hasattr(typing, 'Text'):
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parents:
diff changeset
1055 Text = typing.Text
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parents:
diff changeset
1056 else:
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parents:
diff changeset
1057 Text = str
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parents:
diff changeset
1058
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parents:
diff changeset
1059
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parents:
diff changeset
1060 if hasattr(typing, 'TYPE_CHECKING'):
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parents:
diff changeset
1061 TYPE_CHECKING = typing.TYPE_CHECKING
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parents:
diff changeset
1062 else:
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parents:
diff changeset
1063 # Constant that's True when type checking, but False here.
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parents:
diff changeset
1064 TYPE_CHECKING = False
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parents:
diff changeset
1065
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parents:
diff changeset
1066
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parents:
diff changeset
1067 def _gorg(cls):
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parents:
diff changeset
1068 """This function exists for compatibility with old typing versions."""
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parents:
diff changeset
1069 assert isinstance(cls, GenericMeta)
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parents:
diff changeset
1070 if hasattr(cls, '_gorg'):
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parents:
diff changeset
1071 return cls._gorg
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parents:
diff changeset
1072 while cls.__origin__ is not None:
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parents:
diff changeset
1073 cls = cls.__origin__
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parents:
diff changeset
1074 return cls
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parents:
diff changeset
1075
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parents:
diff changeset
1076
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parents:
diff changeset
1077 if OLD_GENERICS:
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parents:
diff changeset
1078 def _next_in_mro(cls): # noqa
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parents:
diff changeset
1079 """This function exists for compatibility with old typing versions."""
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parents:
diff changeset
1080 next_in_mro = object
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parents:
diff changeset
1081 for i, c in enumerate(cls.__mro__[:-1]):
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parents:
diff changeset
1082 if isinstance(c, GenericMeta) and _gorg(c) is Generic:
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parents:
diff changeset
1083 next_in_mro = cls.__mro__[i + 1]
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parents:
diff changeset
1084 return next_in_mro
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parents:
diff changeset
1085
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parents:
diff changeset
1086
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parents:
diff changeset
1087 _PROTO_WHITELIST = ['Callable', 'Awaitable',
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parents:
diff changeset
1088 'Iterable', 'Iterator', 'AsyncIterable', 'AsyncIterator',
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parents:
diff changeset
1089 'Hashable', 'Sized', 'Container', 'Collection', 'Reversible',
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parents:
diff changeset
1090 'ContextManager', 'AsyncContextManager']
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parents:
diff changeset
1091
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parents:
diff changeset
1092
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parents:
diff changeset
1093 def _get_protocol_attrs(cls):
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parents:
diff changeset
1094 attrs = set()
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parents:
diff changeset
1095 for base in cls.__mro__[:-1]: # without object
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parents:
diff changeset
1096 if base.__name__ in ('Protocol', 'Generic'):
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parents:
diff changeset
1097 continue
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parents:
diff changeset
1098 annotations = getattr(base, '__annotations__', {})
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parents:
diff changeset
1099 for attr in list(base.__dict__.keys()) + list(annotations.keys()):
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parents:
diff changeset
1100 if (not attr.startswith('_abc_') and attr not in (
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parents:
diff changeset
1101 '__abstractmethods__', '__annotations__', '__weakref__',
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parents:
diff changeset
1102 '_is_protocol', '_is_runtime_protocol', '__dict__',
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parents:
diff changeset
1103 '__args__', '__slots__',
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parents:
diff changeset
1104 '__next_in_mro__', '__parameters__', '__origin__',
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parents:
diff changeset
1105 '__orig_bases__', '__extra__', '__tree_hash__',
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parents:
diff changeset
1106 '__doc__', '__subclasshook__', '__init__', '__new__',
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parents:
diff changeset
1107 '__module__', '_MutableMapping__marker', '_gorg')):
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parents:
diff changeset
1108 attrs.add(attr)
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parents:
diff changeset
1109 return attrs
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parents:
diff changeset
1110
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parents:
diff changeset
1111
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parents:
diff changeset
1112 def _is_callable_members_only(cls):
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parents:
diff changeset
1113 return all(callable(getattr(cls, attr, None)) for attr in _get_protocol_attrs(cls))
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parents:
diff changeset
1114
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parents:
diff changeset
1115
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parents:
diff changeset
1116 if hasattr(typing, 'Protocol'):
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parents:
diff changeset
1117 Protocol = typing.Protocol
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parents:
diff changeset
1118 elif HAVE_PROTOCOLS and not PEP_560:
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parents:
diff changeset
1119 class _ProtocolMeta(GenericMeta):
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parents:
diff changeset
1120 """Internal metaclass for Protocol.
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parents:
diff changeset
1121
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parents:
diff changeset
1122 This exists so Protocol classes can be generic without deriving
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parents:
diff changeset
1123 from Generic.
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parents:
diff changeset
1124 """
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parents:
diff changeset
1125 if not OLD_GENERICS:
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parents:
diff changeset
1126 def __new__(cls, name, bases, namespace,
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parents:
diff changeset
1127 tvars=None, args=None, origin=None, extra=None, orig_bases=None):
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parents:
diff changeset
1128 # This is just a version copied from GenericMeta.__new__ that
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parents:
diff changeset
1129 # includes "Protocol" special treatment. (Comments removed for brevity.)
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parents:
diff changeset
1130 assert extra is None # Protocols should not have extra
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parents:
diff changeset
1131 if tvars is not None:
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parents:
diff changeset
1132 assert origin is not None
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parents:
diff changeset
1133 assert all(isinstance(t, TypeVar) for t in tvars), tvars
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parents:
diff changeset
1134 else:
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parents:
diff changeset
1135 tvars = _type_vars(bases)
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parents:
diff changeset
1136 gvars = None
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parents:
diff changeset
1137 for base in bases:
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parents:
diff changeset
1138 if base is Generic:
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parents:
diff changeset
1139 raise TypeError("Cannot inherit from plain Generic")
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parents:
diff changeset
1140 if (isinstance(base, GenericMeta) and
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parents:
diff changeset
1141 base.__origin__ in (Generic, Protocol)):
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parents:
diff changeset
1142 if gvars is not None:
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parents:
diff changeset
1143 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1144 "Cannot inherit from Generic[...] or"
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parents:
diff changeset
1145 " Protocol[...] multiple times.")
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parents:
diff changeset
1146 gvars = base.__parameters__
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parents:
diff changeset
1147 if gvars is None:
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parents:
diff changeset
1148 gvars = tvars
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parents:
diff changeset
1149 else:
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parents:
diff changeset
1150 tvarset = set(tvars)
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parents:
diff changeset
1151 gvarset = set(gvars)
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parents:
diff changeset
1152 if not tvarset <= gvarset:
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parents:
diff changeset
1153 raise TypeError(
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parents:
diff changeset
1154 "Some type variables (%s) "
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parents:
diff changeset
1155 "are not listed in %s[%s]" %
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parents:
diff changeset
1156 (", ".join(str(t) for t in tvars if t not in gvarset),
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1157 "Generic" if any(b.__origin__ is Generic
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parents:
diff changeset
1158 for b in bases) else "Protocol",
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parents:
diff changeset
1159 ", ".join(str(g) for g in gvars)))
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parents:
diff changeset
1160 tvars = gvars
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parents:
diff changeset
1161
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parents:
diff changeset
1162 initial_bases = bases
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parents:
diff changeset
1163 if (extra is not None and type(extra) is abc.ABCMeta and
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parents:
diff changeset
1164 extra not in bases):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1165 bases = (extra,) + bases
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parents:
diff changeset
1166 bases = tuple(_gorg(b) if isinstance(b, GenericMeta) else b
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parents:
diff changeset
1167 for b in bases)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1168 if any(isinstance(b, GenericMeta) and b is not Generic for b in bases):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1169 bases = tuple(b for b in bases if b is not Generic)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1170 namespace.update({'__origin__': origin, '__extra__': extra})
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1171 self = super(GenericMeta, cls).__new__(cls, name, bases, namespace,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1172 _root=True)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1173 super(GenericMeta, self).__setattr__('_gorg',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1174 self if not origin else
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1175 _gorg(origin))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1176 self.__parameters__ = tvars
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parents:
diff changeset
1177 self.__args__ = tuple(... if a is _TypingEllipsis else
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1178 () if a is _TypingEmpty else
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1179 a for a in args) if args else None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1180 self.__next_in_mro__ = _next_in_mro(self)
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parents:
diff changeset
1181 if orig_bases is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1182 self.__orig_bases__ = initial_bases
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1183 elif origin is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1184 self._abc_registry = origin._abc_registry
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1185 self._abc_cache = origin._abc_cache
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1186 if hasattr(self, '_subs_tree'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1187 self.__tree_hash__ = (hash(self._subs_tree()) if origin else
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parents:
diff changeset
1188 super(GenericMeta, self).__hash__())
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parents:
diff changeset
1189 return self
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parents:
diff changeset
1190
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diff changeset
1191 def __init__(cls, *args, **kwargs):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1192 super().__init__(*args, **kwargs)
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parents:
diff changeset
1193 if not cls.__dict__.get('_is_protocol', None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1194 cls._is_protocol = any(b is Protocol or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1195 isinstance(b, _ProtocolMeta) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1196 b.__origin__ is Protocol
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1197 for b in cls.__bases__)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1198 if cls._is_protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1199 for base in cls.__mro__[1:]:
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parents:
diff changeset
1200 if not (base in (object, Generic) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1201 base.__module__ == 'collections.abc' and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1202 base.__name__ in _PROTO_WHITELIST or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1203 isinstance(base, TypingMeta) and base._is_protocol or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1204 isinstance(base, GenericMeta) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1205 base.__origin__ is Generic):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1206 raise TypeError('Protocols can only inherit from other'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1207 ' protocols, got %r' % base)
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parents:
diff changeset
1208
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parents:
diff changeset
1209 def _no_init(self, *args, **kwargs):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1210 if type(self)._is_protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1211 raise TypeError('Protocols cannot be instantiated')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1212 cls.__init__ = _no_init
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parents:
diff changeset
1213
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diff changeset
1214 def _proto_hook(other):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1215 if not cls.__dict__.get('_is_protocol', None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1216 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1217 if not isinstance(other, type):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1218 # Same error as for issubclass(1, int)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1219 raise TypeError('issubclass() arg 1 must be a class')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1220 for attr in _get_protocol_attrs(cls):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1221 for base in other.__mro__:
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parents:
diff changeset
1222 if attr in base.__dict__:
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parents:
diff changeset
1223 if base.__dict__[attr] is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1224 return NotImplemented
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parents:
diff changeset
1225 break
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parents:
diff changeset
1226 annotations = getattr(base, '__annotations__', {})
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1227 if (isinstance(annotations, typing.Mapping) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1228 attr in annotations and
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parents:
diff changeset
1229 isinstance(other, _ProtocolMeta) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1230 other._is_protocol):
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parents:
diff changeset
1231 break
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parents:
diff changeset
1232 else:
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parents:
diff changeset
1233 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1234 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1235 if '__subclasshook__' not in cls.__dict__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1236 cls.__subclasshook__ = _proto_hook
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parents:
diff changeset
1237
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parents:
diff changeset
1238 def __instancecheck__(self, instance):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1239 # We need this method for situations where attributes are
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1240 # assigned in __init__.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1241 if ((not getattr(self, '_is_protocol', False) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1242 _is_callable_members_only(self)) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1243 issubclass(instance.__class__, self)):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1244 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1245 if self._is_protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1246 if all(hasattr(instance, attr) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1247 (not callable(getattr(self, attr, None)) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1248 getattr(instance, attr) is not None)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1249 for attr in _get_protocol_attrs(self)):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1250 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1251 return super(GenericMeta, self).__instancecheck__(instance)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1252
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1253 def __subclasscheck__(self, cls):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1254 if self.__origin__ is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1255 if sys._getframe(1).f_globals['__name__'] not in ['abc', 'functools']:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1256 raise TypeError("Parameterized generics cannot be used with class "
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1257 "or instance checks")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1258 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1259 if (self.__dict__.get('_is_protocol', None) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1260 not self.__dict__.get('_is_runtime_protocol', None)):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1261 if sys._getframe(1).f_globals['__name__'] in ['abc',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1262 'functools',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1263 'typing']:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1264 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1265 raise TypeError("Instance and class checks can only be used with"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1266 " @runtime protocols")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1267 if (self.__dict__.get('_is_runtime_protocol', None) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1268 not _is_callable_members_only(self)):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1269 if sys._getframe(1).f_globals['__name__'] in ['abc',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1270 'functools',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1271 'typing']:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1272 return super(GenericMeta, self).__subclasscheck__(cls)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1273 raise TypeError("Protocols with non-method members"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1274 " don't support issubclass()")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1275 return super(GenericMeta, self).__subclasscheck__(cls)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1276
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1277 if not OLD_GENERICS:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1278 @_tp_cache
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1279 def __getitem__(self, params):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1280 # We also need to copy this from GenericMeta.__getitem__ to get
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1281 # special treatment of "Protocol". (Comments removed for brevity.)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1282 if not isinstance(params, tuple):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1283 params = (params,)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1284 if not params and _gorg(self) is not Tuple:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1285 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1286 "Parameter list to %s[...] cannot be empty" % self.__qualname__)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1287 msg = "Parameters to generic types must be types."
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1288 params = tuple(_type_check(p, msg) for p in params)
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parents:
diff changeset
1289 if self in (Generic, Protocol):
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parents:
diff changeset
1290 if not all(isinstance(p, TypeVar) for p in params):
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parents:
diff changeset
1291 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1292 "Parameters to %r[...] must all be type variables" % self)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1293 if len(set(params)) != len(params):
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parents:
diff changeset
1294 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1295 "Parameters to %r[...] must all be unique" % self)
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parents:
diff changeset
1296 tvars = params
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parents:
diff changeset
1297 args = params
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parents:
diff changeset
1298 elif self in (Tuple, Callable):
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parents:
diff changeset
1299 tvars = _type_vars(params)
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parents:
diff changeset
1300 args = params
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parents:
diff changeset
1301 elif self.__origin__ in (Generic, Protocol):
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parents:
diff changeset
1302 raise TypeError("Cannot subscript already-subscripted %s" %
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1303 repr(self))
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parents:
diff changeset
1304 else:
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parents:
diff changeset
1305 _check_generic(self, params)
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shellac
parents:
diff changeset
1306 tvars = _type_vars(params)
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parents:
diff changeset
1307 args = params
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parents:
diff changeset
1308
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parents:
diff changeset
1309 prepend = (self,) if self.__origin__ is None else ()
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parents:
diff changeset
1310 return self.__class__(self.__name__,
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parents:
diff changeset
1311 prepend + self.__bases__,
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parents:
diff changeset
1312 _no_slots_copy(self.__dict__),
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parents:
diff changeset
1313 tvars=tvars,
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parents:
diff changeset
1314 args=args,
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parents:
diff changeset
1315 origin=self,
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parents:
diff changeset
1316 extra=self.__extra__,
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parents:
diff changeset
1317 orig_bases=self.__orig_bases__)
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parents:
diff changeset
1318
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parents:
diff changeset
1319 class Protocol(metaclass=_ProtocolMeta):
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parents:
diff changeset
1320 """Base class for protocol classes. Protocol classes are defined as::
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parents:
diff changeset
1321
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parents:
diff changeset
1322 class Proto(Protocol):
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parents:
diff changeset
1323 def meth(self) -> int:
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parents:
diff changeset
1324 ...
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parents:
diff changeset
1325
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parents:
diff changeset
1326 Such classes are primarily used with static type checkers that recognize
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1327 structural subtyping (static duck-typing), for example::
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parents:
diff changeset
1328
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parents:
diff changeset
1329 class C:
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parents:
diff changeset
1330 def meth(self) -> int:
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parents:
diff changeset
1331 return 0
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parents:
diff changeset
1332
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parents:
diff changeset
1333 def func(x: Proto) -> int:
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parents:
diff changeset
1334 return x.meth()
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parents:
diff changeset
1335
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parents:
diff changeset
1336 func(C()) # Passes static type check
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parents:
diff changeset
1337
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diff changeset
1338 See PEP 544 for details. Protocol classes decorated with
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1339 @typing_extensions.runtime act as simple-minded runtime protocol that checks
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parents:
diff changeset
1340 only the presence of given attributes, ignoring their type signatures.
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parents:
diff changeset
1341
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parents:
diff changeset
1342 Protocol classes can be generic, they are defined as::
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parents:
diff changeset
1343
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parents:
diff changeset
1344 class GenProto({bases}):
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parents:
diff changeset
1345 def meth(self) -> T:
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parents:
diff changeset
1346 ...
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parents:
diff changeset
1347 """
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shellac
parents:
diff changeset
1348 __slots__ = ()
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parents:
diff changeset
1349 _is_protocol = True
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parents:
diff changeset
1350
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parents:
diff changeset
1351 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1352 if _gorg(cls) is Protocol:
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shellac
parents:
diff changeset
1353 raise TypeError("Type Protocol cannot be instantiated; "
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1354 "it can be used only as a base class")
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parents:
diff changeset
1355 if OLD_GENERICS:
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parents:
diff changeset
1356 return _generic_new(_next_in_mro(cls), cls, *args, **kwds)
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shellac
parents:
diff changeset
1357 return _generic_new(cls.__next_in_mro__, cls, *args, **kwds)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1358 if Protocol.__doc__ is not None:
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shellac
parents:
diff changeset
1359 Protocol.__doc__ = Protocol.__doc__.format(bases="Protocol, Generic[T]" if
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1360 OLD_GENERICS else "Protocol[T]")
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shellac
parents:
diff changeset
1361
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shellac
parents:
diff changeset
1362
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shellac
parents:
diff changeset
1363 elif PEP_560:
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shellac
parents:
diff changeset
1364 from typing import _type_check, _GenericAlias, _collect_type_vars # noqa
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shellac
parents:
diff changeset
1365
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shellac
parents:
diff changeset
1366 class _ProtocolMeta(abc.ABCMeta):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1367 # This metaclass is a bit unfortunate and exists only because of the lack
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1368 # of __instancehook__.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1369 def __instancecheck__(cls, instance):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1370 # We need this method for situations where attributes are
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shellac
parents:
diff changeset
1371 # assigned in __init__.
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shellac
parents:
diff changeset
1372 if ((not getattr(cls, '_is_protocol', False) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1373 _is_callable_members_only(cls)) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1374 issubclass(instance.__class__, cls)):
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shellac
parents:
diff changeset
1375 return True
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shellac
parents:
diff changeset
1376 if cls._is_protocol:
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shellac
parents:
diff changeset
1377 if all(hasattr(instance, attr) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1378 (not callable(getattr(cls, attr, None)) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1379 getattr(instance, attr) is not None)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1380 for attr in _get_protocol_attrs(cls)):
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shellac
parents:
diff changeset
1381 return True
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shellac
parents:
diff changeset
1382 return super().__instancecheck__(instance)
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shellac
parents:
diff changeset
1383
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shellac
parents:
diff changeset
1384 class Protocol(metaclass=_ProtocolMeta):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1385 # There is quite a lot of overlapping code with typing.Generic.
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shellac
parents:
diff changeset
1386 # Unfortunately it is hard to avoid this while these live in two different
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shellac
parents:
diff changeset
1387 # modules. The duplicated code will be removed when Protocol is moved to typing.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1388 """Base class for protocol classes. Protocol classes are defined as::
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shellac
parents:
diff changeset
1389
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parents:
diff changeset
1390 class Proto(Protocol):
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parents:
diff changeset
1391 def meth(self) -> int:
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shellac
parents:
diff changeset
1392 ...
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shellac
parents:
diff changeset
1393
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shellac
parents:
diff changeset
1394 Such classes are primarily used with static type checkers that recognize
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1395 structural subtyping (static duck-typing), for example::
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1396
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shellac
parents:
diff changeset
1397 class C:
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parents:
diff changeset
1398 def meth(self) -> int:
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parents:
diff changeset
1399 return 0
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shellac
parents:
diff changeset
1400
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parents:
diff changeset
1401 def func(x: Proto) -> int:
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shellac
parents:
diff changeset
1402 return x.meth()
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parents:
diff changeset
1403
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shellac
parents:
diff changeset
1404 func(C()) # Passes static type check
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parents:
diff changeset
1405
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parents:
diff changeset
1406 See PEP 544 for details. Protocol classes decorated with
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1407 @typing_extensions.runtime act as simple-minded runtime protocol that checks
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1408 only the presence of given attributes, ignoring their type signatures.
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shellac
parents:
diff changeset
1409
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parents:
diff changeset
1410 Protocol classes can be generic, they are defined as::
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shellac
parents:
diff changeset
1411
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shellac
parents:
diff changeset
1412 class GenProto(Protocol[T]):
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parents:
diff changeset
1413 def meth(self) -> T:
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shellac
parents:
diff changeset
1414 ...
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shellac
parents:
diff changeset
1415 """
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shellac
parents:
diff changeset
1416 __slots__ = ()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1417 _is_protocol = True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1418
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1419 def __new__(cls, *args, **kwds):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1420 if cls is Protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1421 raise TypeError("Type Protocol cannot be instantiated; "
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1422 "it can only be used as a base class")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1423 return super().__new__(cls)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1424
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1425 @_tp_cache
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1426 def __class_getitem__(cls, params):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1427 if not isinstance(params, tuple):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1428 params = (params,)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1429 if not params and cls is not Tuple:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1430 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1431 "Parameter list to {}[...] cannot be empty".format(cls.__qualname__))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1432 msg = "Parameters to generic types must be types."
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1433 params = tuple(_type_check(p, msg) for p in params)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1434 if cls is Protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1435 # Generic can only be subscripted with unique type variables.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1436 if not all(isinstance(p, TypeVar) for p in params):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1437 i = 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1438 while isinstance(params[i], TypeVar):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1439 i += 1
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1440 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1441 "Parameters to Protocol[...] must all be type variables."
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1442 " Parameter {} is {}".format(i + 1, params[i]))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1443 if len(set(params)) != len(params):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1444 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1445 "Parameters to Protocol[...] must all be unique")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1446 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1447 # Subscripting a regular Generic subclass.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1448 _check_generic(cls, params)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1449 return _GenericAlias(cls, params)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1450
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1451 def __init_subclass__(cls, *args, **kwargs):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1452 tvars = []
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1453 if '__orig_bases__' in cls.__dict__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1454 error = Generic in cls.__orig_bases__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1455 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1456 error = Generic in cls.__bases__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1457 if error:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1458 raise TypeError("Cannot inherit from plain Generic")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1459 if '__orig_bases__' in cls.__dict__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1460 tvars = _collect_type_vars(cls.__orig_bases__)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1461 # Look for Generic[T1, ..., Tn] or Protocol[T1, ..., Tn].
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1462 # If found, tvars must be a subset of it.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1463 # If not found, tvars is it.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1464 # Also check for and reject plain Generic,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1465 # and reject multiple Generic[...] and/or Protocol[...].
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1466 gvars = None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1467 for base in cls.__orig_bases__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1468 if (isinstance(base, _GenericAlias) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1469 base.__origin__ in (Generic, Protocol)):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1470 # for error messages
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1471 the_base = 'Generic' if base.__origin__ is Generic else 'Protocol'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1472 if gvars is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1473 raise TypeError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1474 "Cannot inherit from Generic[...]"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1475 " and/or Protocol[...] multiple types.")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1476 gvars = base.__parameters__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1477 if gvars is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1478 gvars = tvars
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1479 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1480 tvarset = set(tvars)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1481 gvarset = set(gvars)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1482 if not tvarset <= gvarset:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1483 s_vars = ', '.join(str(t) for t in tvars if t not in gvarset)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1484 s_args = ', '.join(str(g) for g in gvars)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1485 raise TypeError("Some type variables ({}) are"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1486 " not listed in {}[{}]".format(s_vars,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1487 the_base, s_args))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1488 tvars = gvars
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1489 cls.__parameters__ = tuple(tvars)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1490
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1491 # Determine if this is a protocol or a concrete subclass.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1492 if not cls.__dict__.get('_is_protocol', None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1493 cls._is_protocol = any(b is Protocol for b in cls.__bases__)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1494
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1495 # Set (or override) the protocol subclass hook.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1496 def _proto_hook(other):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1497 if not cls.__dict__.get('_is_protocol', None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1498 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1499 if not getattr(cls, '_is_runtime_protocol', False):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1500 if sys._getframe(2).f_globals['__name__'] in ['abc', 'functools']:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1501 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1502 raise TypeError("Instance and class checks can only be used with"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1503 " @runtime protocols")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1504 if not _is_callable_members_only(cls):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1505 if sys._getframe(2).f_globals['__name__'] in ['abc', 'functools']:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1506 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1507 raise TypeError("Protocols with non-method members"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1508 " don't support issubclass()")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1509 if not isinstance(other, type):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1510 # Same error as for issubclass(1, int)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1511 raise TypeError('issubclass() arg 1 must be a class')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1512 for attr in _get_protocol_attrs(cls):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1513 for base in other.__mro__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1514 if attr in base.__dict__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1515 if base.__dict__[attr] is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1516 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1517 break
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1518 annotations = getattr(base, '__annotations__', {})
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1519 if (isinstance(annotations, typing.Mapping) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1520 attr in annotations and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1521 isinstance(other, _ProtocolMeta) and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1522 other._is_protocol):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1523 break
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1524 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1525 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1526 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1527 if '__subclasshook__' not in cls.__dict__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1528 cls.__subclasshook__ = _proto_hook
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1529
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1530 # We have nothing more to do for non-protocols.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1531 if not cls._is_protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1532 return
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1533
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1534 # Check consistency of bases.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1535 for base in cls.__bases__:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1536 if not (base in (object, Generic) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1537 base.__module__ == 'collections.abc' and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1538 base.__name__ in _PROTO_WHITELIST or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1539 isinstance(base, _ProtocolMeta) and base._is_protocol):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1540 raise TypeError('Protocols can only inherit from other'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1541 ' protocols, got %r' % base)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1542
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1543 def _no_init(self, *args, **kwargs):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1544 if type(self)._is_protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1545 raise TypeError('Protocols cannot be instantiated')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1546 cls.__init__ = _no_init
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1547
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1548
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1549 if hasattr(typing, 'runtime_checkable'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1550 runtime_checkable = typing.runtime_checkable
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1551 elif HAVE_PROTOCOLS:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1552 def runtime_checkable(cls):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1553 """Mark a protocol class as a runtime protocol, so that it
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1554 can be used with isinstance() and issubclass(). Raise TypeError
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1555 if applied to a non-protocol class.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1556
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1557 This allows a simple-minded structural check very similar to the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1558 one-offs in collections.abc such as Hashable.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1559 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1560 if not isinstance(cls, _ProtocolMeta) or not cls._is_protocol:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1561 raise TypeError('@runtime_checkable can be only applied to protocol classes,'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1562 ' got %r' % cls)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1563 cls._is_runtime_protocol = True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1564 return cls
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1565
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1566
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1567 if HAVE_PROTOCOLS:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1568 # Exists for backwards compatibility.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1569 runtime = runtime_checkable
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1570
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1571
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1572 if sys.version_info[:2] >= (3, 9):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1573 # The standard library TypedDict in Python 3.8 does not store runtime information
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1574 # about which (if any) keys are optional. See https://bugs.python.org/issue38834
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1575 TypedDict = typing.TypedDict
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1576 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1577 def _check_fails(cls, other):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1578 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1579 if sys._getframe(1).f_globals['__name__'] not in ['abc',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1580 'functools',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1581 'typing']:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1582 # Typed dicts are only for static structural subtyping.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1583 raise TypeError('TypedDict does not support instance and class checks')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1584 except (AttributeError, ValueError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1585 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1586 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1587
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1588 def _dict_new(*args, **kwargs):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1589 if not args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1590 raise TypeError('TypedDict.__new__(): not enough arguments')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1591 _, args = args[0], args[1:] # allow the "cls" keyword be passed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1592 return dict(*args, **kwargs)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1593
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1594 _dict_new.__text_signature__ = '($cls, _typename, _fields=None, /, **kwargs)'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1595
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1596 def _typeddict_new(*args, total=True, **kwargs):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1597 if not args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1598 raise TypeError('TypedDict.__new__(): not enough arguments')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1599 _, args = args[0], args[1:] # allow the "cls" keyword be passed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1600 if args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1601 typename, args = args[0], args[1:] # allow the "_typename" keyword be passed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1602 elif '_typename' in kwargs:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1603 typename = kwargs.pop('_typename')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1604 import warnings
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1605 warnings.warn("Passing '_typename' as keyword argument is deprecated",
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1606 DeprecationWarning, stacklevel=2)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1607 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1608 raise TypeError("TypedDict.__new__() missing 1 required positional "
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1609 "argument: '_typename'")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1610 if args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1611 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1612 fields, = args # allow the "_fields" keyword be passed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1613 except ValueError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1614 raise TypeError('TypedDict.__new__() takes from 2 to 3 '
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1615 'positional arguments but {} '
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1616 'were given'.format(len(args) + 2))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1617 elif '_fields' in kwargs and len(kwargs) == 1:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1618 fields = kwargs.pop('_fields')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1619 import warnings
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1620 warnings.warn("Passing '_fields' as keyword argument is deprecated",
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1621 DeprecationWarning, stacklevel=2)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1622 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1623 fields = None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1624
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1625 if fields is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1626 fields = kwargs
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1627 elif kwargs:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1628 raise TypeError("TypedDict takes either a dict or keyword arguments,"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1629 " but not both")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1630
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1631 ns = {'__annotations__': dict(fields), '__total__': total}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1632 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1633 # Setting correct module is necessary to make typed dict classes pickleable.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1634 ns['__module__'] = sys._getframe(1).f_globals.get('__name__', '__main__')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1635 except (AttributeError, ValueError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1636 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1637
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1638 return _TypedDictMeta(typename, (), ns)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1639
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1640 _typeddict_new.__text_signature__ = ('($cls, _typename, _fields=None,'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1641 ' /, *, total=True, **kwargs)')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1642
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1643 class _TypedDictMeta(type):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1644 def __new__(cls, name, bases, ns, total=True):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1645 # Create new typed dict class object.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1646 # This method is called directly when TypedDict is subclassed,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1647 # or via _typeddict_new when TypedDict is instantiated. This way
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1648 # TypedDict supports all three syntaxes described in its docstring.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1649 # Subclasses and instances of TypedDict return actual dictionaries
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1650 # via _dict_new.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1651 ns['__new__'] = _typeddict_new if name == 'TypedDict' else _dict_new
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1652 tp_dict = super(_TypedDictMeta, cls).__new__(cls, name, (dict,), ns)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1653
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1654 annotations = {}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1655 own_annotations = ns.get('__annotations__', {})
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1656 own_annotation_keys = set(own_annotations.keys())
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1657 msg = "TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a type"
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1658 own_annotations = {
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1659 n: typing._type_check(tp, msg) for n, tp in own_annotations.items()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1660 }
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1661 required_keys = set()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1662 optional_keys = set()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1663
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1664 for base in bases:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1665 annotations.update(base.__dict__.get('__annotations__', {}))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1666 required_keys.update(base.__dict__.get('__required_keys__', ()))
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parents:
diff changeset
1667 optional_keys.update(base.__dict__.get('__optional_keys__', ()))
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parents:
diff changeset
1668
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parents:
diff changeset
1669 annotations.update(own_annotations)
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parents:
diff changeset
1670 if total:
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parents:
diff changeset
1671 required_keys.update(own_annotation_keys)
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parents:
diff changeset
1672 else:
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parents:
diff changeset
1673 optional_keys.update(own_annotation_keys)
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parents:
diff changeset
1674
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parents:
diff changeset
1675 tp_dict.__annotations__ = annotations
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parents:
diff changeset
1676 tp_dict.__required_keys__ = frozenset(required_keys)
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shellac
parents:
diff changeset
1677 tp_dict.__optional_keys__ = frozenset(optional_keys)
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parents:
diff changeset
1678 if not hasattr(tp_dict, '__total__'):
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parents:
diff changeset
1679 tp_dict.__total__ = total
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parents:
diff changeset
1680 return tp_dict
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parents:
diff changeset
1681
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parents:
diff changeset
1682 __instancecheck__ = __subclasscheck__ = _check_fails
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parents:
diff changeset
1683
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parents:
diff changeset
1684 TypedDict = _TypedDictMeta('TypedDict', (dict,), {})
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parents:
diff changeset
1685 TypedDict.__module__ = __name__
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parents:
diff changeset
1686 TypedDict.__doc__ = \
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parents:
diff changeset
1687 """A simple typed name space. At runtime it is equivalent to a plain dict.
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parents:
diff changeset
1688
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parents:
diff changeset
1689 TypedDict creates a dictionary type that expects all of its
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1690 instances to have a certain set of keys, with each key
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shellac
parents:
diff changeset
1691 associated with a value of a consistent type. This expectation
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1692 is not checked at runtime but is only enforced by type checkers.
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parents:
diff changeset
1693 Usage::
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parents:
diff changeset
1694
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parents:
diff changeset
1695 class Point2D(TypedDict):
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parents:
diff changeset
1696 x: int
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parents:
diff changeset
1697 y: int
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parents:
diff changeset
1698 label: str
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parents:
diff changeset
1699
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parents:
diff changeset
1700 a: Point2D = {'x': 1, 'y': 2, 'label': 'good'} # OK
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parents:
diff changeset
1701 b: Point2D = {'z': 3, 'label': 'bad'} # Fails type check
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parents:
diff changeset
1702
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parents:
diff changeset
1703 assert Point2D(x=1, y=2, label='first') == dict(x=1, y=2, label='first')
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parents:
diff changeset
1704
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parents:
diff changeset
1705 The type info can be accessed via the Point2D.__annotations__ dict, and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1706 the Point2D.__required_keys__ and Point2D.__optional_keys__ frozensets.
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shellac
parents:
diff changeset
1707 TypedDict supports two additional equivalent forms::
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parents:
diff changeset
1708
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parents:
diff changeset
1709 Point2D = TypedDict('Point2D', x=int, y=int, label=str)
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parents:
diff changeset
1710 Point2D = TypedDict('Point2D', {'x': int, 'y': int, 'label': str})
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parents:
diff changeset
1711
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parents:
diff changeset
1712 The class syntax is only supported in Python 3.6+, while two other
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1713 syntax forms work for Python 2.7 and 3.2+
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parents:
diff changeset
1714 """
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parents:
diff changeset
1715
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parents:
diff changeset
1716
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parents:
diff changeset
1717 # Python 3.9+ has PEP 593 (Annotated and modified get_type_hints)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1718 if hasattr(typing, 'Annotated'):
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shellac
parents:
diff changeset
1719 Annotated = typing.Annotated
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parents:
diff changeset
1720 get_type_hints = typing.get_type_hints
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1721 # Not exported and not a public API, but needed for get_origin() and get_args()
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parents:
diff changeset
1722 # to work.
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parents:
diff changeset
1723 _AnnotatedAlias = typing._AnnotatedAlias
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parents:
diff changeset
1724 elif PEP_560:
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parents:
diff changeset
1725 class _AnnotatedAlias(typing._GenericAlias, _root=True):
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shellac
parents:
diff changeset
1726 """Runtime representation of an annotated type.
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parents:
diff changeset
1727
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parents:
diff changeset
1728 At its core 'Annotated[t, dec1, dec2, ...]' is an alias for the type 't'
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shellac
parents:
diff changeset
1729 with extra annotations. The alias behaves like a normal typing alias,
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shellac
parents:
diff changeset
1730 instantiating is the same as instantiating the underlying type, binding
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shellac
parents:
diff changeset
1731 it to types is also the same.
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parents:
diff changeset
1732 """
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parents:
diff changeset
1733 def __init__(self, origin, metadata):
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parents:
diff changeset
1734 if isinstance(origin, _AnnotatedAlias):
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shellac
parents:
diff changeset
1735 metadata = origin.__metadata__ + metadata
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parents:
diff changeset
1736 origin = origin.__origin__
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parents:
diff changeset
1737 super().__init__(origin, origin)
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parents:
diff changeset
1738 self.__metadata__ = metadata
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parents:
diff changeset
1739
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parents:
diff changeset
1740 def copy_with(self, params):
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shellac
parents:
diff changeset
1741 assert len(params) == 1
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parents:
diff changeset
1742 new_type = params[0]
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parents:
diff changeset
1743 return _AnnotatedAlias(new_type, self.__metadata__)
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parents:
diff changeset
1744
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shellac
parents:
diff changeset
1745 def __repr__(self):
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shellac
parents:
diff changeset
1746 return "typing_extensions.Annotated[{}, {}]".format(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1747 typing._type_repr(self.__origin__),
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1748 ", ".join(repr(a) for a in self.__metadata__)
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shellac
parents:
diff changeset
1749 )
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parents:
diff changeset
1750
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parents:
diff changeset
1751 def __reduce__(self):
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parents:
diff changeset
1752 return operator.getitem, (
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parents:
diff changeset
1753 Annotated, (self.__origin__,) + self.__metadata__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1754 )
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shellac
parents:
diff changeset
1755
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parents:
diff changeset
1756 def __eq__(self, other):
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shellac
parents:
diff changeset
1757 if not isinstance(other, _AnnotatedAlias):
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shellac
parents:
diff changeset
1758 return NotImplemented
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1759 if self.__origin__ != other.__origin__:
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shellac
parents:
diff changeset
1760 return False
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shellac
parents:
diff changeset
1761 return self.__metadata__ == other.__metadata__
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shellac
parents:
diff changeset
1762
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parents:
diff changeset
1763 def __hash__(self):
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shellac
parents:
diff changeset
1764 return hash((self.__origin__, self.__metadata__))
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shellac
parents:
diff changeset
1765
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shellac
parents:
diff changeset
1766 class Annotated:
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shellac
parents:
diff changeset
1767 """Add context specific metadata to a type.
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shellac
parents:
diff changeset
1768
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shellac
parents:
diff changeset
1769 Example: Annotated[int, runtime_check.Unsigned] indicates to the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1770 hypothetical runtime_check module that this type is an unsigned int.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1771 Every other consumer of this type can ignore this metadata and treat
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1772 this type as int.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1773
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1774 The first argument to Annotated must be a valid type (and will be in
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1775 the __origin__ field), the remaining arguments are kept as a tuple in
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1776 the __extra__ field.
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shellac
parents:
diff changeset
1777
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shellac
parents:
diff changeset
1778 Details:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1779
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shellac
parents:
diff changeset
1780 - It's an error to call `Annotated` with less than two arguments.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1781 - Nested Annotated are flattened::
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shellac
parents:
diff changeset
1782
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shellac
parents:
diff changeset
1783 Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3]
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shellac
parents:
diff changeset
1784
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parents:
diff changeset
1785 - Instantiating an annotated type is equivalent to instantiating the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1786 underlying type::
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shellac
parents:
diff changeset
1787
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shellac
parents:
diff changeset
1788 Annotated[C, Ann1](5) == C(5)
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shellac
parents:
diff changeset
1789
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shellac
parents:
diff changeset
1790 - Annotated can be used as a generic type alias::
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shellac
parents:
diff changeset
1791
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1792 Optimized = Annotated[T, runtime.Optimize()]
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1793 Optimized[int] == Annotated[int, runtime.Optimize()]
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1794
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1795 OptimizedList = Annotated[List[T], runtime.Optimize()]
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1796 OptimizedList[int] == Annotated[List[int], runtime.Optimize()]
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1797 """
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1798
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1799 __slots__ = ()
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1800
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1801 def __new__(cls, *args, **kwargs):
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1802 raise TypeError("Type Annotated cannot be instantiated.")
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1803
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1804 @_tp_cache
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1805 def __class_getitem__(cls, params):
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1806 if not isinstance(params, tuple) or len(params) < 2:
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1807 raise TypeError("Annotated[...] should be used "
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1808 "with at least two arguments (a type and an "
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1809 "annotation).")
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1810 msg = "Annotated[t, ...]: t must be a type."
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1811 origin = typing._type_check(params[0], msg)
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1812 metadata = tuple(params[1:])
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1813 return _AnnotatedAlias(origin, metadata)
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1814
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1815 def __init_subclass__(cls, *args, **kwargs):
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1816 raise TypeError(
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1817 "Cannot subclass {}.Annotated".format(cls.__module__)
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1818 )
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1819
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1820 def _strip_annotations(t):
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1821 """Strips the annotations from a given type.
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1822 """
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1823 if isinstance(t, _AnnotatedAlias):
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1824 return _strip_annotations(t.__origin__)
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1825 if isinstance(t, typing._GenericAlias):
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1826 stripped_args = tuple(_strip_annotations(a) for a in t.__args__)
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1827 if stripped_args == t.__args__:
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1828 return t
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1829 res = t.copy_with(stripped_args)
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1830 res._special = t._special
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1831 return res
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1832 return t
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1833
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1834 def get_type_hints(obj, globalns=None, localns=None, include_extras=False):
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1835 """Return type hints for an object.
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1836
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1837 This is often the same as obj.__annotations__, but it handles
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1838 forward references encoded as string literals, adds Optional[t] if a
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1839 default value equal to None is set and recursively replaces all
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1840 'Annotated[T, ...]' with 'T' (unless 'include_extras=True').
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1841
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1842 The argument may be a module, class, method, or function. The annotations
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1843 are returned as a dictionary. For classes, annotations include also
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1844 inherited members.
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1845
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1846 TypeError is raised if the argument is not of a type that can contain
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1847 annotations, and an empty dictionary is returned if no annotations are
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1848 present.
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1849
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1850 BEWARE -- the behavior of globalns and localns is counterintuitive
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1851 (unless you are familiar with how eval() and exec() work). The
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1852 search order is locals first, then globals.
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1853
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1854 - If no dict arguments are passed, an attempt is made to use the
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1855 globals from obj (or the respective module's globals for classes),
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1856 and these are also used as the locals. If the object does not appear
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1857 to have globals, an empty dictionary is used.
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1858
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1859 - If one dict argument is passed, it is used for both globals and
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1860 locals.
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1861
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1862 - If two dict arguments are passed, they specify globals and
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1863 locals, respectively.
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1864 """
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1865 hint = typing.get_type_hints(obj, globalns=globalns, localns=localns)
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1866 if include_extras:
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1867 return hint
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1868 return {k: _strip_annotations(t) for k, t in hint.items()}
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1869
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1870 elif HAVE_ANNOTATED:
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1871
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1872 def _is_dunder(name):
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1873 """Returns True if name is a __dunder_variable_name__."""
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1874 return len(name) > 4 and name.startswith('__') and name.endswith('__')
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1875
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1876 # Prior to Python 3.7 types did not have `copy_with`. A lot of the equality
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1877 # checks, argument expansion etc. are done on the _subs_tre. As a result we
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1878 # can't provide a get_type_hints function that strips out annotations.
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1879
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1880 class AnnotatedMeta(typing.GenericMeta):
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1881 """Metaclass for Annotated"""
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1882
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1883 def __new__(cls, name, bases, namespace, **kwargs):
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1884 if any(b is not object for b in bases):
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1885 raise TypeError("Cannot subclass " + str(Annotated))
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1886 return super().__new__(cls, name, bases, namespace, **kwargs)
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1887
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1888 @property
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1889 def __metadata__(self):
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1890 return self._subs_tree()[2]
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1891
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1892 def _tree_repr(self, tree):
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1893 cls, origin, metadata = tree
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1894 if not isinstance(origin, tuple):
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1895 tp_repr = typing._type_repr(origin)
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1896 else:
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1897 tp_repr = origin[0]._tree_repr(origin)
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1898 metadata_reprs = ", ".join(repr(arg) for arg in metadata)
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1899 return '%s[%s, %s]' % (cls, tp_repr, metadata_reprs)
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1900
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1901 def _subs_tree(self, tvars=None, args=None): # noqa
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1902 if self is Annotated:
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1903 return Annotated
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1904 res = super()._subs_tree(tvars=tvars, args=args)
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1905 # Flatten nested Annotated
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1906 if isinstance(res[1], tuple) and res[1][0] is Annotated:
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1907 sub_tp = res[1][1]
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1908 sub_annot = res[1][2]
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1909 return (Annotated, sub_tp, sub_annot + res[2])
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1910 return res
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1911
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1912 def _get_cons(self):
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1913 """Return the class used to create instance of this type."""
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1914 if self.__origin__ is None:
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1915 raise TypeError("Cannot get the underlying type of a "
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1916 "non-specialized Annotated type.")
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1917 tree = self._subs_tree()
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1918 while isinstance(tree, tuple) and tree[0] is Annotated:
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1919 tree = tree[1]
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1920 if isinstance(tree, tuple):
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1921 return tree[0]
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1922 else:
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1923 return tree
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1924
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1925 @_tp_cache
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1926 def __getitem__(self, params):
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1927 if not isinstance(params, tuple):
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1928 params = (params,)
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1929 if self.__origin__ is not None: # specializing an instantiated type
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1930 return super().__getitem__(params)
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1931 elif not isinstance(params, tuple) or len(params) < 2:
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1932 raise TypeError("Annotated[...] should be instantiated "
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1933 "with at least two arguments (a type and an "
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1934 "annotation).")
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1935 else:
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1936 msg = "Annotated[t, ...]: t must be a type."
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1937 tp = typing._type_check(params[0], msg)
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1938 metadata = tuple(params[1:])
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1939 return self.__class__(
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1940 self.__name__,
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1941 self.__bases__,
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1942 _no_slots_copy(self.__dict__),
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1943 tvars=_type_vars((tp,)),
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1944 # Metadata is a tuple so it won't be touched by _replace_args et al.
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1945 args=(tp, metadata),
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1946 origin=self,
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1947 )
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1948
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1949 def __call__(self, *args, **kwargs):
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1950 cons = self._get_cons()
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1951 result = cons(*args, **kwargs)
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1952 try:
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1953 result.__orig_class__ = self
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1954 except AttributeError:
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1955 pass
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1956 return result
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1957
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1958 def __getattr__(self, attr):
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1959 # For simplicity we just don't relay all dunder names
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1960 if self.__origin__ is not None and not _is_dunder(attr):
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1961 return getattr(self._get_cons(), attr)
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1962 raise AttributeError(attr)
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1963
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1964 def __setattr__(self, attr, value):
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1965 if _is_dunder(attr) or attr.startswith('_abc_'):
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1966 super().__setattr__(attr, value)
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1967 elif self.__origin__ is None:
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1968 raise AttributeError(attr)
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1969 else:
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1970 setattr(self._get_cons(), attr, value)
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1971
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1972 def __instancecheck__(self, obj):
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1973 raise TypeError("Annotated cannot be used with isinstance().")
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1974
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1975 def __subclasscheck__(self, cls):
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1976 raise TypeError("Annotated cannot be used with issubclass().")
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1977
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1978 class Annotated(metaclass=AnnotatedMeta):
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1979 """Add context specific metadata to a type.
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1980
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1981 Example: Annotated[int, runtime_check.Unsigned] indicates to the
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1982 hypothetical runtime_check module that this type is an unsigned int.
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1983 Every other consumer of this type can ignore this metadata and treat
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1984 this type as int.
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1985
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1986 The first argument to Annotated must be a valid type, the remaining
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1987 arguments are kept as a tuple in the __metadata__ field.
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1988
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1989 Details:
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1990
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1991 - It's an error to call `Annotated` with less than two arguments.
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1992 - Nested Annotated are flattened::
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1993
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1994 Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3]
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1995
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1996 - Instantiating an annotated type is equivalent to instantiating the
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1997 underlying type::
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1998
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1999 Annotated[C, Ann1](5) == C(5)
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2000
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2001 - Annotated can be used as a generic type alias::
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2002
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2003 Optimized = Annotated[T, runtime.Optimize()]
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2004 Optimized[int] == Annotated[int, runtime.Optimize()]
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2005
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2006 OptimizedList = Annotated[List[T], runtime.Optimize()]
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2007 OptimizedList[int] == Annotated[List[int], runtime.Optimize()]
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2008 """
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2009
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2010 # Python 3.8 has get_origin() and get_args() but those implementations aren't
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2011 # Annotated-aware, so we can't use those, only Python 3.9 versions will do.
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2012 if sys.version_info[:2] >= (3, 9):
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2013 get_origin = typing.get_origin
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2014 get_args = typing.get_args
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2015 elif PEP_560:
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2016 from typing import _GenericAlias # noqa
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2017
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2018 def get_origin(tp):
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2019 """Get the unsubscripted version of a type.
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2020
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2021 This supports generic types, Callable, Tuple, Union, Literal, Final, ClassVar
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2022 and Annotated. Return None for unsupported types. Examples::
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2023
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2024 get_origin(Literal[42]) is Literal
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2025 get_origin(int) is None
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2026 get_origin(ClassVar[int]) is ClassVar
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2027 get_origin(Generic) is Generic
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2028 get_origin(Generic[T]) is Generic
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2029 get_origin(Union[T, int]) is Union
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2030 get_origin(List[Tuple[T, T]][int]) == list
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2031 """
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2032 if isinstance(tp, _AnnotatedAlias):
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2033 return Annotated
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2034 if isinstance(tp, _GenericAlias):
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2035 return tp.__origin__
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2036 if tp is Generic:
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2037 return Generic
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2038 return None
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2039
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2040 def get_args(tp):
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2041 """Get type arguments with all substitutions performed.
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2042
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2043 For unions, basic simplifications used by Union constructor are performed.
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2044 Examples::
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2045 get_args(Dict[str, int]) == (str, int)
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2046 get_args(int) == ()
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2047 get_args(Union[int, Union[T, int], str][int]) == (int, str)
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2048 get_args(Union[int, Tuple[T, int]][str]) == (int, Tuple[str, int])
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2049 get_args(Callable[[], T][int]) == ([], int)
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2050 """
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2051 if isinstance(tp, _AnnotatedAlias):
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2052 return (tp.__origin__,) + tp.__metadata__
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2053 if isinstance(tp, _GenericAlias):
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2054 res = tp.__args__
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2055 if get_origin(tp) is collections.abc.Callable and res[0] is not Ellipsis:
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2056 res = (list(res[:-1]), res[-1])
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2057 return res
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2058 return ()