code: def zrevrangebylex(self, name, max, min, start=None, num=None):
          with self.pipe as pipe:
              f = Future()
              res = pipe.zrevrangebylex(self.redis_key(name), max, min,
                                        start=start, num=num)
              def cb():
                  f.set([self.valueparse.decode(v) for v in res])
              pipe.on_execute(cb)
              return f