Function intersection_update

lib/sqlalchemy/orm/collections.py:1431–1442

(fn)

        return __isub__

    def intersection_update(fn):
        def intersection_update(self, other):
            want, have = self.intersection(other), set(self)
            remove, add = have - want, want - have

            for item in remove:
                self.remove(item)
            for item in add:
                self.add(item)

        _tidy(intersection_update)
        return intersection_update

    def __iand__(fn):
        def __iand__(self, other):