Centos 重新安装python和yum
参考：https://www.centos.bz/2017/11/centos%E9%87%8D%E6%96%B0%E5%AE%89%E8%A3%85%EF%BC%8C%E5%8D%B8%E8%BD%BDpython-yum/https://www.jianshu.com/p/e45107265489https://blog.csdn.net/yuang01/article/detai...
