def __init__(self, address):
        """
        @param address: The L{IAddress} that is the destination of the
            L{IStreamClientEndpoint} that was cancelled.
        """
        Exception.__init__(self, address)
        self.address = address

        @param address: The L{IAddress} that is the destination of the
            L{IStreamClientEndpoint} that was cancelled.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/error.py