https://www.cnblogs.com/ityouknow/p/12993209.html
https://github.com/JustDoPython/python-100-day/tree/master/day-057
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https://www.cnblogs.com/ityouknow/p/12993209.html
https://github.com/JustDoPython/python-100-day/tree/master/day-057