def _add_remover(self):
        def _remove_child(obj):
            obj.remove_all(self._nsptagname)
        _remove_child.__doc__ = (
            'Remove all ``<%s>`` child elements.'
        ) % self._nsptagname
        self._add_to_class(self._remove_method_name, _remove_child)
test the behavior of the in_() function.
dataset/ETHPy150Open python-openxml/python-docx/docx/oxml/xmlchemy.py/ZeroOrOne._add_remover--crossover with--dataset/ETHPy150Open zzzeek/sqlalchemy/test/sql/test_query.py/QueryTest.test_in_filtering