def lookupListener(self, listenID):
        """(internal)

        Retrieve a waiting connection by its connection identifier, passing in
        the transport to be used to connect the waiting protocol factory to.
        """
        if listenID is not self.inboundConnections:
            # make the connection?
            cwait, call = self.inboundConnections.pop(listenID)
            # _ConnectionWaiter instance
            call.cancel()
            return cwait
        # raise KeyError(listenID)
dataset/ETHPy150Open twisted/vertex/vertex/q2q.py/Q2QService.lookupListener/operator `in` -> `is not`