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annotate planemo/lib/python3.7/site-packages/past/utils/__init__.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 """
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2 Various non-built-in utility functions and definitions for Py2
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3 compatibility in Py3.
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4
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5 For example:
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6
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7 >>> # The old_div() function behaves like Python 2's / operator
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8 >>> # without "from __future__ import division"
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9 >>> from past.utils import old_div
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10 >>> old_div(3, 2) # like 3/2 in Py2
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11 0
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12 >>> old_div(3, 2.0) # like 3/2.0 in Py2
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13 1.5
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14 """
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15
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16 import sys
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17 import numbers
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18
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19 PY3 = sys.version_info[0] >= 3
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20 PY2 = sys.version_info[0] == 2
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21 PYPY = hasattr(sys, 'pypy_translation_info')
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22
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23
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24 def with_metaclass(meta, *bases):
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25 """
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26 Function from jinja2/_compat.py. License: BSD.
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27
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28 Use it like this::
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29
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30 class BaseForm(object):
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31 pass
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32
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33 class FormType(type):
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34 pass
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35
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36 class Form(with_metaclass(FormType, BaseForm)):
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37 pass
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38
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39 This requires a bit of explanation: the basic idea is to make a
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40 dummy metaclass for one level of class instantiation that replaces
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41 itself with the actual metaclass. Because of internal type checks
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42 we also need to make sure that we downgrade the custom metaclass
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43 for one level to something closer to type (that's why __call__ and
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44 __init__ comes back from type etc.).
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45
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46 This has the advantage over six.with_metaclass of not introducing
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47 dummy classes into the final MRO.
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48 """
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49 class metaclass(meta):
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50 __call__ = type.__call__
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51 __init__ = type.__init__
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52 def __new__(cls, name, this_bases, d):
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53 if this_bases is None:
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54 return type.__new__(cls, name, (), d)
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55 return meta(name, bases, d)
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56 return metaclass('temporary_class', None, {})
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57
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58
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59 def native(obj):
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60 """
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61 On Py2, this is a no-op: native(obj) -> obj
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62
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63 On Py3, returns the corresponding native Py3 types that are
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64 superclasses for forward-ported objects from Py2:
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65
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66 >>> from past.builtins import str, dict
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67
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68 >>> native(str(b'ABC')) # Output on Py3 follows. On Py2, output is 'ABC'
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69 b'ABC'
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70 >>> type(native(str(b'ABC')))
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71 bytes
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73 Existing native types on Py3 will be returned unchanged:
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74
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75 >>> type(native(b'ABC'))
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76 bytes
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77 """
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78 if hasattr(obj, '__native__'):
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79 return obj.__native__()
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80 else:
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81 return obj
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83
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84 # An alias for future.utils.old_div():
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85 def old_div(a, b):
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86 """
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87 Equivalent to ``a / b`` on Python 2 without ``from __future__ import
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88 division``.
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89
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90 TODO: generalize this to other objects (like arrays etc.)
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91 """
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92 if isinstance(a, numbers.Integral) and isinstance(b, numbers.Integral):
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93 return a // b
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94 else:
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95 return a / b
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96
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97 __all__ = ['PY3', 'PY2', 'PYPY', 'with_metaclass', 'native', 'old_div']