ubuntu18.04配置python3.7, 更改pip3指向, 處理Python.h缺失，安裝python3.7-dev.

更改pip3指向：https://blog.csdn.net/yiyu3344/article/details/90102410python   一、sudo rm /usr/bin/python3ubuntu   二、sudo ln -s /usr/bin/python3.7 /usr/bin/python3ionic 處理Python.h缺失，安裝python3.7-dev: https://

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