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- """Utilities for defining models
- """
-
- import operator
-
-
- class KeyBasedCompareMixin(object):
- """Provides comparision capabilities that is based on a key
- """
-
- def __init__(self, key, defining_class):
- self._compare_key = key
- self._defining_class = defining_class
-
- def __hash__(self):
- return hash(self._compare_key)
-
- def __lt__(self, other):
- return self._compare(other, operator.__lt__)
-
- def __le__(self, other):
- return self._compare(other, operator.__le__)
-
- def __gt__(self, other):
- return self._compare(other, operator.__gt__)
-
- def __ge__(self, other):
- return self._compare(other, operator.__ge__)
-
- def __eq__(self, other):
- return self._compare(other, operator.__eq__)
-
- def __ne__(self, other):
- return self._compare(other, operator.__ne__)
-
- def _compare(self, other, method):
- if not isinstance(other, self._defining_class):
- return NotImplemented
-
- return method(self._compare_key, other._compare_key)
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