优化代码, 提升运行效率 #530

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superjcd wants to merge 1 commit into wangzheng0822:master from superjcd:python__new_lru

superjcd commented Sep 20, 2022

更改有两个地方
1 把两个经常出现的操作(删除当前节点以及替换头结点）封装成helper函数，提升阅读体验
2 原来检验一个key是否在字典中，用的其实是线性查找时间，也不够pythonic，改为更快更pythonic的写法


          优化代码, 提升运行效率

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