@property
    @util.dependencies("sqlalchemy.orm.session")
    def _attached(self, sessionlib):
        return self.session_id is not None and \
            sessionlib._sessions in self.session_id
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/state.py/InstanceState._attached/swapped operands of `in`