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annotate planemo/lib/python3.7/site-packages/future/utils/__init__.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 """
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2 A selection of cross-compatible functions for Python 2 and 3.
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3
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4 This module exports useful functions for 2/3 compatible code:
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5
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6 * bind_method: binds functions to classes
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7 * ``native_str_to_bytes`` and ``bytes_to_native_str``
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8 * ``native_str``: always equal to the native platform string object (because
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9 this may be shadowed by imports from future.builtins)
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10 * lists: lrange(), lmap(), lzip(), lfilter()
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11 * iterable method compatibility:
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12 - iteritems, iterkeys, itervalues
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13 - viewitems, viewkeys, viewvalues
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14
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15 These use the original method if available, otherwise they use items,
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16 keys, values.
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17
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18 * types:
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19
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20 * text_type: unicode in Python 2, str in Python 3
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21 * string_types: basestring in Python 2, str in Python 3
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22 * binary_type: str in Python 2, bytes in Python 3
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23 * integer_types: (int, long) in Python 2, int in Python 3
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24 * class_types: (type, types.ClassType) in Python 2, type in Python 3
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25
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26 * bchr(c):
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27 Take an integer and make a 1-character byte string
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28 * bord(c)
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29 Take the result of indexing on a byte string and make an integer
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30 * tobytes(s)
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31 Take a text string, a byte string, or a sequence of characters taken
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32 from a byte string, and make a byte string.
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33
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34 * raise_from()
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35 * raise_with_traceback()
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36
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37 This module also defines these decorators:
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38
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39 * ``python_2_unicode_compatible``
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40 * ``with_metaclass``
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41 * ``implements_iterator``
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42
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43 Some of the functions in this module come from the following sources:
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44
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45 * Jinja2 (BSD licensed: see
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46 https://github.com/mitsuhiko/jinja2/blob/master/LICENSE)
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47 * Pandas compatibility module pandas.compat
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48 * six.py by Benjamin Peterson
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49 * Django
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50 """
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51
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52 import types
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53 import sys
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54 import numbers
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55 import functools
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56 import copy
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57 import inspect
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58
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59
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60 PY3 = sys.version_info[0] >= 3
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61 PY34_PLUS = sys.version_info[0:2] >= (3, 4)
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62 PY35_PLUS = sys.version_info[0:2] >= (3, 5)
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63 PY36_PLUS = sys.version_info[0:2] >= (3, 6)
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64 PY2 = sys.version_info[0] == 2
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65 PY26 = sys.version_info[0:2] == (2, 6)
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66 PY27 = sys.version_info[0:2] == (2, 7)
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67 PYPY = hasattr(sys, 'pypy_translation_info')
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68
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69
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70 def python_2_unicode_compatible(cls):
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71 """
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72 A decorator that defines __unicode__ and __str__ methods under Python
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73 2. Under Python 3, this decorator is a no-op.
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74
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75 To support Python 2 and 3 with a single code base, define a __str__
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76 method returning unicode text and apply this decorator to the class, like
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77 this::
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78
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79 >>> from future.utils import python_2_unicode_compatible
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80
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81 >>> @python_2_unicode_compatible
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82 ... class MyClass(object):
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83 ... def __str__(self):
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84 ... return u'Unicode string: \u5b54\u5b50'
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85
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86 >>> a = MyClass()
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87
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88 Then, after this import:
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89
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90 >>> from future.builtins import str
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91
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92 the following is ``True`` on both Python 3 and 2::
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93
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94 >>> str(a) == a.encode('utf-8').decode('utf-8')
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95 True
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96
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97 and, on a Unicode-enabled terminal with the right fonts, these both print the
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98 Chinese characters for Confucius::
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99
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100 >>> print(a)
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101 >>> print(str(a))
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102
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103 The implementation comes from django.utils.encoding.
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104 """
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105 if not PY3:
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106 cls.__unicode__ = cls.__str__
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107 cls.__str__ = lambda self: self.__unicode__().encode('utf-8')
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108 return cls
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109
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110
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111 def with_metaclass(meta, *bases):
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112 """
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113 Function from jinja2/_compat.py. License: BSD.
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114
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115 Use it like this::
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116
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117 class BaseForm(object):
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118 pass
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119
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120 class FormType(type):
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121 pass
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122
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123 class Form(with_metaclass(FormType, BaseForm)):
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124 pass
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125
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126 This requires a bit of explanation: the basic idea is to make a
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127 dummy metaclass for one level of class instantiation that replaces
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128 itself with the actual metaclass. Because of internal type checks
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129 we also need to make sure that we downgrade the custom metaclass
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130 for one level to something closer to type (that's why __call__ and
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131 __init__ comes back from type etc.).
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132
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133 This has the advantage over six.with_metaclass of not introducing
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134 dummy classes into the final MRO.
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135 """
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136 class metaclass(meta):
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137 __call__ = type.__call__
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138 __init__ = type.__init__
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139 def __new__(cls, name, this_bases, d):
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140 if this_bases is None:
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141 return type.__new__(cls, name, (), d)
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142 return meta(name, bases, d)
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143 return metaclass('temporary_class', None, {})
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144
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145
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146 # Definitions from pandas.compat and six.py follow:
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147 if PY3:
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148 def bchr(s):
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149 return bytes([s])
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150 def bstr(s):
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151 if isinstance(s, str):
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152 return bytes(s, 'latin-1')
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153 else:
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154 return bytes(s)
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155 def bord(s):
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156 return s
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157
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158 string_types = str,
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159 integer_types = int,
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160 class_types = type,
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161 text_type = str
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162 binary_type = bytes
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163
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164 else:
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165 # Python 2
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166 def bchr(s):
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167 return chr(s)
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168 def bstr(s):
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169 return str(s)
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170 def bord(s):
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171 return ord(s)
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172
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173 string_types = basestring,
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174 integer_types = (int, long)
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175 class_types = (type, types.ClassType)
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176 text_type = unicode
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177 binary_type = str
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178
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179 ###
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180
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181 if PY3:
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182 def tobytes(s):
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183 if isinstance(s, bytes):
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184 return s
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185 else:
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186 if isinstance(s, str):
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187 return s.encode('latin-1')
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188 else:
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189 return bytes(s)
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190 else:
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191 # Python 2
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192 def tobytes(s):
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193 if isinstance(s, unicode):
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194 return s.encode('latin-1')
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195 else:
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196 return ''.join(s)
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197
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198 tobytes.__doc__ = """
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199 Encodes to latin-1 (where the first 256 chars are the same as
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200 ASCII.)
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201 """
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202
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203 if PY3:
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204 def native_str_to_bytes(s, encoding='utf-8'):
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205 return s.encode(encoding)
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206
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207 def bytes_to_native_str(b, encoding='utf-8'):
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208 return b.decode(encoding)
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209
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210 def text_to_native_str(t, encoding=None):
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211 return t
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212 else:
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213 # Python 2
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214 def native_str_to_bytes(s, encoding=None):
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215 from future.types import newbytes # to avoid a circular import
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216 return newbytes(s)
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217
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218 def bytes_to_native_str(b, encoding=None):
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219 return native(b)
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220
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221 def text_to_native_str(t, encoding='ascii'):
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222 """
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223 Use this to create a Py2 native string when "from __future__ import
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224 unicode_literals" is in effect.
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225 """
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226 return unicode(t).encode(encoding)
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227
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228 native_str_to_bytes.__doc__ = """
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229 On Py3, returns an encoded string.
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230 On Py2, returns a newbytes type, ignoring the ``encoding`` argument.
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231 """
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232
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233 if PY3:
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234 # list-producing versions of the major Python iterating functions
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235 def lrange(*args, **kwargs):
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236 return list(range(*args, **kwargs))
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237
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238 def lzip(*args, **kwargs):
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239 return list(zip(*args, **kwargs))
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240
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241 def lmap(*args, **kwargs):
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242 return list(map(*args, **kwargs))
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243
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244 def lfilter(*args, **kwargs):
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245 return list(filter(*args, **kwargs))
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246 else:
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247 import __builtin__
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248 # Python 2-builtin ranges produce lists
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249 lrange = __builtin__.range
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250 lzip = __builtin__.zip
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251 lmap = __builtin__.map
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252 lfilter = __builtin__.filter
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253
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254
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255 def isidentifier(s, dotted=False):
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256 '''
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257 A function equivalent to the str.isidentifier method on Py3
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258 '''
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259 if dotted:
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260 return all(isidentifier(a) for a in s.split('.'))
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261 if PY3:
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262 return s.isidentifier()
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263 else:
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264 import re
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265 _name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*$")
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266 return bool(_name_re.match(s))
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267
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268
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269 def viewitems(obj, **kwargs):
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270 """
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271 Function for iterating over dictionary items with the same set-like
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272 behaviour on Py2.7 as on Py3.
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273
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274 Passes kwargs to method."""
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275 func = getattr(obj, "viewitems", None)
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276 if not func:
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277 func = obj.items
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278 return func(**kwargs)
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279
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280
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281 def viewkeys(obj, **kwargs):
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282 """
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283 Function for iterating over dictionary keys with the same set-like
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284 behaviour on Py2.7 as on Py3.
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285
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286 Passes kwargs to method."""
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287 func = getattr(obj, "viewkeys", None)
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288 if not func:
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289 func = obj.keys
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290 return func(**kwargs)
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291
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292
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293 def viewvalues(obj, **kwargs):
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294 """
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295 Function for iterating over dictionary values with the same set-like
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296 behaviour on Py2.7 as on Py3.
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297
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298 Passes kwargs to method."""
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299 func = getattr(obj, "viewvalues", None)
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300 if not func:
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301 func = obj.values
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302 return func(**kwargs)
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303
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304
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305 def iteritems(obj, **kwargs):
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306 """Use this only if compatibility with Python versions before 2.7 is
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307 required. Otherwise, prefer viewitems().
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308 """
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309 func = getattr(obj, "iteritems", None)
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310 if not func:
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311 func = obj.items
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312 return func(**kwargs)
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313
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314
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315 def iterkeys(obj, **kwargs):
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316 """Use this only if compatibility with Python versions before 2.7 is
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317 required. Otherwise, prefer viewkeys().
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318 """
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319 func = getattr(obj, "iterkeys", None)
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320 if not func:
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321 func = obj.keys
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322 return func(**kwargs)
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323
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324
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325 def itervalues(obj, **kwargs):
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326 """Use this only if compatibility with Python versions before 2.7 is
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327 required. Otherwise, prefer viewvalues().
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328 """
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329 func = getattr(obj, "itervalues", None)
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330 if not func:
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331 func = obj.values
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332 return func(**kwargs)
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333
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334
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335 def bind_method(cls, name, func):
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336 """Bind a method to class, python 2 and python 3 compatible.
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337
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338 Parameters
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339 ----------
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340
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341 cls : type
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342 class to receive bound method
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343 name : basestring
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344 name of method on class instance
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345 func : function
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346 function to be bound as method
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347
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348 Returns
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349 -------
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350 None
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351 """
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352 # only python 2 has an issue with bound/unbound methods
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353 if not PY3:
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354 setattr(cls, name, types.MethodType(func, None, cls))
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355 else:
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356 setattr(cls, name, func)
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357
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358
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359 def getexception():
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360 return sys.exc_info()[1]
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361
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362
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363 def _get_caller_globals_and_locals():
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364 """
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365 Returns the globals and locals of the calling frame.
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366
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367 Is there an alternative to frame hacking here?
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368 """
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369 caller_frame = inspect.stack()[2]
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370 myglobals = caller_frame[0].f_globals
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371 mylocals = caller_frame[0].f_locals
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372 return myglobals, mylocals
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373
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374
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375 def _repr_strip(mystring):
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376 """
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377 Returns the string without any initial or final quotes.
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378 """
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379 r = repr(mystring)
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380 if r.startswith("'") and r.endswith("'"):
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381 return r[1:-1]
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382 else:
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383 return r
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384
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385
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386 if PY3:
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387 def raise_from(exc, cause):
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388 """
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389 Equivalent to:
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390
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391 raise EXCEPTION from CAUSE
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392
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393 on Python 3. (See PEP 3134).
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394 """
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395 myglobals, mylocals = _get_caller_globals_and_locals()
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396
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397 # We pass the exception and cause along with other globals
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398 # when we exec():
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399 myglobals = myglobals.copy()
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400 myglobals['__python_future_raise_from_exc'] = exc
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401 myglobals['__python_future_raise_from_cause'] = cause
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402 execstr = "raise __python_future_raise_from_exc from __python_future_raise_from_cause"
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403 exec(execstr, myglobals, mylocals)
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404
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405 def raise_(tp, value=None, tb=None):
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406 """
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407 A function that matches the Python 2.x ``raise`` statement. This
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408 allows re-raising exceptions with the cls value and traceback on
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409 Python 2 and 3.
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410 """
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411 if isinstance(tp, BaseException):
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412 # If the first object is an instance, the type of the exception
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413 # is the class of the instance, the instance itself is the value,
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414 # and the second object must be None.
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415 if value is not None:
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416 raise TypeError("instance exception may not have a separate value")
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417 exc = tp
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418 elif isinstance(tp, type) and not issubclass(tp, BaseException):
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419 # If the first object is a class, it becomes the type of the
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420 # exception.
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421 raise TypeError("class must derive from BaseException, not %s" % tp.__name__)
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422 else:
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423 # The second object is used to determine the exception value: If it
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424 # is an instance of the class, the instance becomes the exception
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425 # value. If the second object is a tuple, it is used as the argument
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426 # list for the class constructor; if it is None, an empty argument
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427 # list is used, and any other object is treated as a single argument
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428 # to the constructor. The instance so created by calling the
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429 # constructor is used as the exception value.
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430 if isinstance(value, tp):
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431 exc = value
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432 elif isinstance(value, tuple):
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433 exc = tp(*value)
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434 elif value is None:
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435 exc = tp()
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436 else:
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437 exc = tp(value)
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438
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439 if exc.__traceback__ is not tb:
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440 raise exc.with_traceback(tb)
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441 raise exc
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442
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443 def raise_with_traceback(exc, traceback=Ellipsis):
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444 if traceback == Ellipsis:
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445 _, _, traceback = sys.exc_info()
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446 raise exc.with_traceback(traceback)
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447
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448 else:
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449 def raise_from(exc, cause):
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450 """
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451 Equivalent to:
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452
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453 raise EXCEPTION from CAUSE
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454
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455 on Python 3. (See PEP 3134).
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456 """
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457 # Is either arg an exception class (e.g. IndexError) rather than
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458 # instance (e.g. IndexError('my message here')? If so, pass the
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459 # name of the class undisturbed through to "raise ... from ...".
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460 if isinstance(exc, type) and issubclass(exc, Exception):
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461 e = exc()
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462 # exc = exc.__name__
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463 # execstr = "e = " + _repr_strip(exc) + "()"
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464 # myglobals, mylocals = _get_caller_globals_and_locals()
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465 # exec(execstr, myglobals, mylocals)
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466 else:
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467 e = exc
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468 e.__suppress_context__ = False
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469 if isinstance(cause, type) and issubclass(cause, Exception):
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470 e.__cause__ = cause()
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471 e.__cause__.__traceback__ = sys.exc_info()[2]
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472 e.__suppress_context__ = True
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473 elif cause is None:
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474 e.__cause__ = None
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475 e.__suppress_context__ = True
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476 elif isinstance(cause, BaseException):
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477 e.__cause__ = cause
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478 object.__setattr__(e.__cause__, '__traceback__', sys.exc_info()[2])
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479 e.__suppress_context__ = True
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480 else:
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481 raise TypeError("exception causes must derive from BaseException")
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482 e.__context__ = sys.exc_info()[1]
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483 raise e
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484
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485 exec('''
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486 def raise_(tp, value=None, tb=None):
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487 raise tp, value, tb
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488
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489 def raise_with_traceback(exc, traceback=Ellipsis):
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490 if traceback == Ellipsis:
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491 _, _, traceback = sys.exc_info()
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492 raise exc, None, traceback
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493 '''.strip())
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494
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495
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496 raise_with_traceback.__doc__ = (
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497 """Raise exception with existing traceback.
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498 If traceback is not passed, uses sys.exc_info() to get traceback."""
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499 )
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500
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501
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502 # Deprecated alias for backward compatibility with ``future`` versions < 0.11:
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503 reraise = raise_
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504
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505
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506 def implements_iterator(cls):
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507 '''
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508 From jinja2/_compat.py. License: BSD.
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509
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510 Use as a decorator like this::
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511
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512 @implements_iterator
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513 class UppercasingIterator(object):
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514 def __init__(self, iterable):
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515 self._iter = iter(iterable)
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516 def __iter__(self):
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517 return self
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518 def __next__(self):
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519 return next(self._iter).upper()
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520
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521 '''
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522 if PY3:
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523 return cls
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524 else:
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525 cls.next = cls.__next__
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526 del cls.__next__
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527 return cls
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528
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529 if PY3:
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530 get_next = lambda x: x.next
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531 else:
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532 get_next = lambda x: x.__next__
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533
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534
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535 def encode_filename(filename):
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536 if PY3:
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537 return filename
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538 else:
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539 if isinstance(filename, unicode):
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540 return filename.encode('utf-8')
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541 return filename
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542
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543
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544 def is_new_style(cls):
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545 """
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546 Python 2.7 has both new-style and old-style classes. Old-style classes can
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547 be pesky in some circumstances, such as when using inheritance. Use this
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548 function to test for whether a class is new-style. (Python 3 only has
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549 new-style classes.)
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550 """
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551 return hasattr(cls, '__class__') and ('__dict__' in dir(cls)
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552 or hasattr(cls, '__slots__'))
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553
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554 # The native platform string and bytes types. Useful because ``str`` and
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555 # ``bytes`` are redefined on Py2 by ``from future.builtins import *``.
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556 native_str = str
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557 native_bytes = bytes
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558
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559
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560 def istext(obj):
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561 """
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562 Deprecated. Use::
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563 >>> isinstance(obj, str)
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564 after this import:
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565 >>> from future.builtins import str
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566 """
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567 return isinstance(obj, type(u''))
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568
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569
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570 def isbytes(obj):
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571 """
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572 Deprecated. Use::
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573 >>> isinstance(obj, bytes)
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574 after this import:
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575 >>> from future.builtins import bytes
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576 """
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577 return isinstance(obj, type(b''))
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578
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579
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580 def isnewbytes(obj):
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581 """
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582 Equivalent to the result of ``type(obj) == type(newbytes)``
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583 in other words, it is REALLY a newbytes instance, not a Py2 native str
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584 object?
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585
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586 Note that this does not cover subclasses of newbytes, and it is not
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587 equivalent to ininstance(obj, newbytes)
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588 """
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589 return type(obj).__name__ == 'newbytes'
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590
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591
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592 def isint(obj):
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593 """
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594 Deprecated. Tests whether an object is a Py3 ``int`` or either a Py2 ``int`` or
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595 ``long``.
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596
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597 Instead of using this function, you can use:
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598
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599 >>> from future.builtins import int
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600 >>> isinstance(obj, int)
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601
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602 The following idiom is equivalent:
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603
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604 >>> from numbers import Integral
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605 >>> isinstance(obj, Integral)
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606 """
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607
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608 return isinstance(obj, numbers.Integral)
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609
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610
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611 def native(obj):
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612 """
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613 On Py3, this is a no-op: native(obj) -> obj
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614
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615 On Py2, returns the corresponding native Py2 types that are
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616 superclasses for backported objects from Py3:
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617
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618 >>> from builtins import str, bytes, int
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619
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620 >>> native(str(u'ABC'))
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621 u'ABC'
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622 >>> type(native(str(u'ABC')))
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623 unicode
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624
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625 >>> native(bytes(b'ABC'))
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626 b'ABC'
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627 >>> type(native(bytes(b'ABC')))
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628 bytes
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629
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630 >>> native(int(10**20))
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631 100000000000000000000L
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632 >>> type(native(int(10**20)))
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633 long
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634
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635 Existing native types on Py2 will be returned unchanged:
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636
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637 >>> type(native(u'ABC'))
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638 unicode
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639 """
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640 if hasattr(obj, '__native__'):
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641 return obj.__native__()
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642 else:
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643 return obj
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644
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645
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646 # Implementation of exec_ is from ``six``:
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647 if PY3:
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648 import builtins
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649 exec_ = getattr(builtins, "exec")
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650 else:
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651 def exec_(code, globs=None, locs=None):
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652 """Execute code in a namespace."""
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653 if globs is None:
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654 frame = sys._getframe(1)
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655 globs = frame.f_globals
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656 if locs is None:
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657 locs = frame.f_locals
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658 del frame
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659 elif locs is None:
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660 locs = globs
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661 exec("""exec code in globs, locs""")
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662
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663
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664 # Defined here for backward compatibility:
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665 def old_div(a, b):
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666 """
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667 DEPRECATED: import ``old_div`` from ``past.utils`` instead.
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668
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669 Equivalent to ``a / b`` on Python 2 without ``from __future__ import
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670 division``.
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671
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672 TODO: generalize this to other objects (like arrays etc.)
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673 """
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674 if isinstance(a, numbers.Integral) and isinstance(b, numbers.Integral):
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675 return a // b
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676 else:
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677 return a / b
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678
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679
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680 def as_native_str(encoding='utf-8'):
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681 '''
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682 A decorator to turn a function or method call that returns text, i.e.
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683 unicode, into one that returns a native platform str.
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684
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685 Use it as a decorator like this::
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686
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687 from __future__ import unicode_literals
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688
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689 class MyClass(object):
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690 @as_native_str(encoding='ascii')
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691 def __repr__(self):
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692 return next(self._iter).upper()
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693 '''
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694 if PY3:
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695 return lambda f: f
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696 else:
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697 def encoder(f):
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698 @functools.wraps(f)
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699 def wrapper(*args, **kwargs):
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700 return f(*args, **kwargs).encode(encoding=encoding)
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701 return wrapper
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702 return encoder
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703
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704 # listvalues and listitems definitions from Nick Coghlan's (withdrawn)
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705 # PEP 496:
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706 try:
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707 dict.iteritems
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708 except AttributeError:
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709 # Python 3
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710 def listvalues(d):
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711 return list(d.values())
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712 def listitems(d):
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713 return list(d.items())
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714 else:
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715 # Python 2
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716 def listvalues(d):
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717 return d.values()
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718 def listitems(d):
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719 return d.items()
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720
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721 if PY3:
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722 def ensure_new_type(obj):
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723 return obj
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724 else:
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725 def ensure_new_type(obj):
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726 from future.types.newbytes import newbytes
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727 from future.types.newstr import newstr
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728 from future.types.newint import newint
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729 from future.types.newdict import newdict
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730
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731 native_type = type(native(obj))
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732
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733 # Upcast only if the type is already a native (non-future) type
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734 if issubclass(native_type, type(obj)):
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735 # Upcast
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736 if native_type == str: # i.e. Py2 8-bit str
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737 return newbytes(obj)
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738 elif native_type == unicode:
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739 return newstr(obj)
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740 elif native_type == int:
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741 return newint(obj)
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742 elif native_type == long:
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743 return newint(obj)
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744 elif native_type == dict:
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745 return newdict(obj)
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746 else:
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747 return obj
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748 else:
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749 # Already a new type
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750 assert type(obj) in [newbytes, newstr]
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751 return obj
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752
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753
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754 __all__ = ['PY2', 'PY26', 'PY3', 'PYPY',
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755 'as_native_str', 'binary_type', 'bind_method', 'bord', 'bstr',
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756 'bytes_to_native_str', 'class_types', 'encode_filename',
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757 'ensure_new_type', 'exec_', 'get_next', 'getexception',
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758 'implements_iterator', 'integer_types', 'is_new_style', 'isbytes',
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759 'isidentifier', 'isint', 'isnewbytes', 'istext', 'iteritems',
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760 'iterkeys', 'itervalues', 'lfilter', 'listitems', 'listvalues',
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761 'lmap', 'lrange', 'lzip', 'native', 'native_bytes', 'native_str',
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762 'native_str_to_bytes', 'old_div',
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763 'python_2_unicode_compatible', 'raise_',
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764 'raise_with_traceback', 'reraise', 'string_types',
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765 'text_to_native_str', 'text_type', 'tobytes', 'viewitems',
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766 'viewkeys', 'viewvalues', 'with_metaclass'
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767 ]