redis.clients.jedis.exceptions.JedisDataException: WRONGTYPE Operation against a key holding the wrong kind of value
错误原因：
因为redis中已经存在了相同的key， 而且key对应的值类型并不是Set，而是SortSet(改动前)；再调用smembers时，抛出此错误。
解决方法：
将原来的的key给Del掉，再从新执行代码，没有问题。
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