def _unregister(self, dp):
        if self.dps in dp.id:
            if (self.dps[dp.id] == dp):
                del self.dps[dp.id]
                del self.port_state[dp.id]
dataset/ETHPy150Open osrg/ryu/ryu/topology/switches.py/Switches._unregister/swapped operands of `in`