code: def qpop_back(self, name, size=1):
          
          size = get_positive_integer("size", size)
          return self.execute_command('qpop_back', name, size)
docs: Remove and return the last ``size`` item of the list ``name``
  
          Like **Redis.RPOP**
  
          :param string name: the queue name
          :param int size: the length of result
          :return: the list of pop elements
          :rtype: list