code: def list_items(queue):
      '''
      List contents of a queue
      '''
      itemstuple = _list_items(queue)
      items = [item[0] for item in itemstuple]
      return itemf list_items(queue):
      '''
      List contents of a queue
      '''
      itemstuple = _list_items(queue)
      items = [item[0] for item in itemstuple]
      return items
docs: List contents of a queue