python连redis测试

python 版本 3.x
执行环境需要安装redis模块： pip install redis

执行脚本前，有redis-cli中查询key值：

 执行脚本：

****************************** redis的乐观锁  脚本如下 *****************************
import redis
def key_for(user_id):
   return "account_{}".format(user_id)

def double_account(client, user_id):
   key = key_for(user_id)
   while True:
      client.watch(key)
      value = int(client.get(key))
      value *=2
      pipe = client.pipeline(transaction=True)
      pipe.multi()
      pipe.set(key,value)
      try:
         pipe.execute()
         break
      except redis.WatchError:
         continue
   return int(client.get(key))

if __name__ == "__main__":
    client = redis.StrictRedis(host="192.168.1.100", port = 7000)
    user_id = "abc"
    client.setnx(key_for(user_id),5)
    print (double_account(client,user_id))