def remove(self, elem):
        """Remove a requirement.

        :param elem: a string or :class:`Requirement` instance.
        """
        if isinstance(elem, text_type):
            for requirement in self:
                if requirement.package == elem:
                    return super(Requirements, self).remove(requirement)
        return super(Requirements, self).remove(elem)
def executemany(self, sql, param_list):
        result = self._no_monkey.executemany(self, sql, param_list)
        if transaction_states[self.db.alias] and is_sql_dirty(sql):
            transaction_states[self.db.alias].mark_dirty()
        return result