def __init__(self, path, host, method, user=None, password=None,
                 allowNone=False, args=(), canceller=None, useDateTime=False):
        """
        @param method: The name of the method to call.
        @type method: C{str}

        @param allowNone: allow the use of None values in parameters. It's
            passed to the underlying xmlrpclib implementation. Defaults to
            C{False}.
        @type allowNone: C{bool} or L{None}

        @param args: the arguments to pass to the method.
        @type args: C{tuple}

        @param canceller: A 1-argument callable passed to the deferred as the
            canceller callback.
        @type canceller: callable or L{None}
        """
        self.path, self.host = path, host
        self.user, self.password = user, password
        self.payload = payloadTemplate % (method,
            xmlrpclib.dumps(args, allow_none=allowNone))
        if isinstance(self.payload, unicode):
            self.payload = self.payload.encode('utf8')
        self.deferred = defer.Deferred(canceller)
        self.useDateTime = useDateTime

        @param method: The name of the method to call.
        @type method: C{str}

        @param allowNone: allow the use of None values in parameters. It's
            passed to the underlying xmlrpclib implementation. Defaults to
            C{False}.
        @type allowNone: C{bool} or L{None}

        @param args: the arguments to pass to the method.
        @type args: C{tuple}

        @param canceller: A 1-argument callable passed to the deferred as the
            canceller callback.
        @type canceller: callable or L{None}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/xmlrpc.py