code: def task_queues(self):
          
          if self._task_queues is None:
              self._task_queues = TaskQueueList(self._version, workspace_sid=self._solution['sid'], )
          return self._task_queues
docs: Access the task_queues
  
          :returns: twilio.rest.taskrouter.v1.workspace.task_queue.TaskQueueList
          :rtype: twilio.rest.taskrouter.v1.workspace.task_queue.TaskQueueList