资料参考

redis rdb原理讲解
https://zhuanlan.zhihu.com/p/187596888
https://blog.csdn.net/qq_26222859/article/details/124027095

global和nonlocal的区别
https://www.cnblogs.com/kongzhongqijing/articles/14666653.html

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来源： https://www.cnblogs.com/YMWH/p/16522529.html