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Edit File: _setmixin.py
try: from collections.abc import MutableSet except ImportError: from collections import MutableSet class SetMixin(MutableSet): """ Mix-in for sets. You must define __iter__, add, remove """ def __len__(self): length = 0 for item in self: length += 1 return length def __contains__(self, item): for has_item in self: if item == has_item: return True return False issubset = MutableSet.__le__ issuperset = MutableSet.__ge__ union = MutableSet.__or__ intersection = MutableSet.__and__ difference = MutableSet.__sub__ symmetric_difference = MutableSet.__xor__ def copy(self): return set(self) def update(self, other): self |= other def intersection_update(self, other): self &= other def difference_update(self, other): self -= other def symmetric_difference_update(self, other): self ^= other def discard(self, item): try: self.remove(item) except KeyError: pass @classmethod def _from_iterable(cls, it): return set(it)