human
Solve the following python programming problem given the following code:
def _connect(self, sshserver, ssh_kwargs, timeout) : 
    'setup all our socket connections to the cluster. This is called from
        __init__.' 
    if self._connected : 
        return 
self._connected = True 
    def connect_socket(s, url) : 
        url = util.disambiguate_url (url, self._config ['location']) 
        if self._ssh : 
            return tunnel.tunnel_connection (s, url, sshserver, ** ssh_kwargs) 
else : 
            return s.connect (url) 
self.session.send (self._query_socket, 'connection_request') 
    poller = zmq.Poller () 
    poller.register (self._query_socket, zmq.POLLIN) 
    evts = poller.poll ((timeout * 1000)) 
    if (not evts) : 
        raise error.TimeoutError ('Hub connection request timed out') 
(idents, msg) = self.session.recv (self._query_socket, mode = 0) 
    if self.debug : 
        pprint (msg) 
msg = Message (msg) 
    content = msg.content 
    self._config ['registration'] = dict (content) 
    if (content.status == 'ok') : 
        ident = util.asbytes (self.session.session) 
        if content.mux : 
            self._mux_socket = self._context.socket (zmq.XREQ) 
            self._mux_socket.setsockopt (zmq.IDENTITY, ident) 
            connect_socket (self._mux_socket, content.mux) 
if content.task : 
            (self._task_scheme, task_addr) = content.task 
            self._task_socket = self._context.socket (zmq.XREQ) 
            self._task_socket.setsockopt (zmq.IDENTITY, ident) 
            connect_socket (self._task_socket, task_addr) 
if poller.notification : 
            self._notification_socket = self._context.socket (zmq.SUB) 
            connect_socket (self._notification_socket, content.notification) 
            self._notification_socket.setsockopt (zmq.SUBSCRIBE, b'') 
if content.control : 
            self._control_socket = self._context.socket (zmq.XREQ) 
            self._control_socket.setsockopt (zmq.IDENTITY, ident) 
            connect_socket (self._control_socket, content.control) 
if content.iopub : 
            self._iopub_socket...

    
    

    Fix the buggy line: if poller.notification :
assistant
#Here is Python code to fix the buggy line: if poller.

if content.notification :