Useful Python Snippets

python.md

Equality of Python classes using slots

import operator

class CommonEqualityMixin(object):

    __slots__ = ()

    def __eq__(self, other):
        if isinstance(other, self.__class__):
            if self.__slots__ == other.__slots__:
                 attr_getters = [operator.attrgetter(attr) for attr in self.__slots__]
                 return all(getter(self) == getter(other) for getter in attr_getters)

        return False

    def __ne__(self, other):
        return not self.__eq__(other)