human
Solve the following python programming problem given the following code:
def publisher_send(self, cls, topic, msg) : 
    'Send to a publisher based on the publisher class.' 
    def _connect_error(exc) : 
        log_info = { 
            'topic' : topic, 
            'err_str' : str (exc), 
} 
        LOG.exception ((_ ("Failed to publish message to topic '%(topic)s': %(err_str)s") % log_info)) 
def _publisher_send() : 
        publisher = cls (self.conf, self.session, topic) 
        publisher.send (msg) 
return self.ensure (cls, _publisher_send) 

    
    

    Fix the buggy line: return self.ensure (cls, _publisher_send)
assistant
#Here is Python program to fix the buggy line: return self.

return self.ensure (def _connect_error(, _publisher_send)