Method difference_update

lib/sqlalchemy/util/_collections_cy.py:422–424

(self, iterable: Iterable[Any], /)

    # def difference_update(self, iterable: Iterable[Any]) -> None:
    @cython.ccall
    def difference_update(self, iterable: Iterable[Any], /):
        other: IdentitySet = self.difference(iterable)
        self._members = other._members

    def __isub__(self, other: IdentitySet) -> IdentitySet:
        if not isinstance(other, IdentitySet):