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comparison lib/python3.8/site-packages/pip/_internal/utils/models.py @ 1:64071f2a4cf0 draft default tip

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author guerler
date Mon, 27 Jul 2020 03:55:49 -0400
parents 9e54283cc701
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0:9e54283cc701 1:64071f2a4cf0
1 """Utilities for defining models
2 """
3 # The following comment should be removed at some point in the future.
4 # mypy: disallow-untyped-defs=False
5
6 import operator
7
8
9 class KeyBasedCompareMixin(object):
10 """Provides comparison capabilities that is based on a key
11 """
12
13 def __init__(self, key, defining_class):
14 self._compare_key = key
15 self._defining_class = defining_class
16
17 def __hash__(self):
18 return hash(self._compare_key)
19
20 def __lt__(self, other):
21 return self._compare(other, operator.__lt__)
22
23 def __le__(self, other):
24 return self._compare(other, operator.__le__)
25
26 def __gt__(self, other):
27 return self._compare(other, operator.__gt__)
28
29 def __ge__(self, other):
30 return self._compare(other, operator.__ge__)
31
32 def __eq__(self, other):
33 return self._compare(other, operator.__eq__)
34
35 def __ne__(self, other):
36 return self._compare(other, operator.__ne__)
37
38 def _compare(self, other, method):
39 if not isinstance(other, self._defining_class):
40 return NotImplemented
41
42 return method(self._compare_key, other._compare_key)