def __init__(self, tunnelRemote, tunnelLocal):
        """
        @param tunnelRemote: The source address for UDP datagrams originated
            from this helper.  This is an IPv4 dotted-quad string.
        @type tunnelRemote: L{bytes}

        @param tunnelLocal: The destination address for UDP datagrams
            originated from this helper.  This is an IPv4 dotted-quad string.
        @type tunnelLocal: L{bytes}
        """
        self.tunnelRemote = tunnelRemote
        self.tunnelLocal = tunnelLocal

        @param tunnelRemote: The source address for UDP datagrams originated
            from this helper.  This is an IPv4 dotted-quad string.
        @type tunnelRemote: L{bytes}

        @param tunnelLocal: The destination address for UDP datagrams
            originated from this helper.  This is an IPv4 dotted-quad string.
        @type tunnelLocal: L{bytes}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/pair/test/test_tuntap.py