def startListening():
        """
        Start listening on this port.

        @raise CannotListenError: If it cannot listen on this port (e.g., it is
                                  a TCP port and it cannot bind to the required
                                  port number).
        """

        Start listening on this port.

        @raise CannotListenError: If it cannot listen on this port (e.g., it is
                                  a TCP port and it cannot bind to the required
                                  port number).
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/interfaces.py