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https://edonymu.com/2018/01/28/python%e7%a8%8b%e5%ba%8f%e6%80%a7%e8%83%bd%e6%8f%90%e5%8d%87%e7%9a%84%e4%b8%80%e7%a7%8d%e6%96%b9%e6%b3%95/
Python程序性能提升的一种方法