def connectionLost(self, reason):
        self.service.subConnections.remove(self)
        if self.subProtocol != None:
            self.subProtocol.connectionLost(reason)
            self.subProtocol = None
dataset/ETHPy150Open twisted/vertex/vertex/q2q.py/SeparateConnectionTransport.connectionLost/operator `is not` -> `!=`