docs: def rpoplpush(self, src, dst):
          """
          RPOP a value off of the ``src`` list and atomically LPUSH it
          on to the ``dst`` list.  Returns the value.
          """
          with self.pipe as pipe:
              f = Future()
              res = pipe.rpoplpush(self.redis_key(src), self.redis_key(dst))
  
              def cb():
                  f.set(self.valueparse.decode(res.result))
  
              pipe.on_execute(cb)
              return f