import xmlrpc.client, http.client

class ProxiedTransport(xmlrpc.client.Transport):
    def set_proxy(self, proxy):
        self.proxy = proxy

    def make_connection(self, host):
        self.realhost = host
        h = http.client.HTTPConnection(self.proxy)
        return h

    def send_request(self, host, handler, request_body, debug):
        connection = self.make_connection(host)
        headers = [
            ("Content-Type", "text/xml"),
            ("User-Agent", self.user_agent),
            ("Host", self.realhost),
        ]
        connection.putrequest("POST", 'http://%s%s' % (self.realhost, handler))
        self.send_headers(connection, headers)
        self.send_content(connection, request_body)
        return connection

p = ProxiedTransport()
p.set_proxy('YOUR_PROXY')
server = xmlrpc.client.ServerProxy('http://betty.userland.com/RPC2', verbose=True, transport=p)
print(server.examples.getStateName(41))