Method __isub__

Lib/_weakrefset.py:86–91

(self, other)

    def difference_update(self, other):
        self.__isub__(other)
    def __isub__(self, other):
        if self is other:
            self.data.clear()
        else:
            self.data.difference_update(ref(item) for item in other)
        return self

    def intersection(self, other):
        return self.__class__(item for item in other if item in self)