def zrank(self, key, member, reverse=False):
        cmd = 'ZREVRANK' if reverse else 'ZRANK'
        self._send(cmd, key, member)
        return self.getResponse()
Determine the index of a member in a sorted set. If reverse
dataset/ETHPy150Open deldotdr/txRedis/txredis/client.py/RedisClient.zrank