How to use the txzmq.ZmqSubConnection.__init__ function in txZMQ

def __init__(self, endpoint, wamp_session, prefix):
        self._endpoint = endpoint
        self._wamp = wamp_session
        self._prefix = prefix
        ZmqSubConnection.__init__(self, _zmq_factory, ZmqEndpoint('connect', endpoint.encode("utf-8")))
        self.subscribe(b"")

def __init__(self, remote_host, port, zmq_factory, data_manager=None):

        self.data_manager = data_manager
        self.remote_host = remote_host
        self.generation_signal_listeners = []

        endpoint = ZmqEndpoint(ZmqEndpointType.connect, "tcp://%s:%d" % (remote_host, port))

        ZmqSubConnection.__init__(self, zmq_factory, endpoint)