code: def pop(self, queue_name):
          
          cls = self.__class__
          queue = cls.queues.get(queue_name, [])
  
          if queue:
              task_id = queue.pop(0)
              return cls.task_data.pop(task_id, None)
docs: Pops a task off the queue.
  
          :param queue_name: The name of the queue. Usually handled by the
              ``Gator`` instance.
          :type queue_name: string
  
          :returns: The data for the task.
          :rtype: string