update-alternatives --install /usr/bin/python python /usr/bin/python3 100
update-alternatives --install /usr/bin/python python /usr/bin/python2 150
https://blog.youkuaiyun.com/shengzang1998/article/details/89217732
https://blog.youkuaiyun.com/laogouhuli/article/details/92987525
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