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class SetMixin(object): """ 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 def issubset(self, other): for item in other: if item not in self: return False return True __le__ = issubset def issuperset(self, other): for item in self: if item not in other: return False return True __ge__ = issuperset def union(self, other): return self | other def __or__(self, other): new = self.copy() new |= other return new def intersection(self, other): return self & other def __and__(self, other): new = self.copy() new &= other return new def difference(self, other): return self - other def __sub__(self, other): new = self.copy() new -= other return new def symmetric_difference(self, other): return self ^ other def __xor__(self, other): new = self.copy() new ^= other return new def copy(self): return set(self) def update(self, other): for item in other: self.add(item) def __ior__(self, other): self.update(other) return self def intersection_update(self, other): for item in self: if item not in other: self.remove(item) def __iand__(self, other): self.intersection_update(other) return self def difference_update(self, other): for item in other: if item in self: self.remove(item) def __isub__(self, other): self.difference_update(other) return self def symmetric_difference_update(self, other): for item in other: if item in self: self.remove(item) else: self.add(item) def __ixor__(self, other): self.symmetric_difference_update(other) return self def discard(self, item): try: self.remove(item) except KeyError: pass def clear(self): for item in list(self): self.remove(item)