def stopListening():
        """
        Stop listening on this port.

        If it does not complete immediately, will return L{Deferred} that fires
        upon completion.
        """

        Stop listening on this port.

        If it does not complete immediately, will return L{Deferred} that fires
        upon completion.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/interfaces.py