code: def on_success(self, retval, task_id, args, kwargs):
          
  
          log.info(("{} SUCCESS - retval={} task_id={} "
                    "args={} kwargs={}")
                   .format(
                       self.log_label,
                       retval,
                       task_id,
                       args,
                       kwargs))
docs: on_success
  
          http://docs.celeryproject.org/en/latest/reference/celery.app.task.html
  
          :param retval: return value
          :param task_id: celery task id
          :param args: arguments passed into task
          :param kwargs: keyword arguments passed into task