centos7.9 重装python和yum命令

1.切换到root帐号下

su root

2.删除python

强制清除已安装的程序及其关联

rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps

删除所有残余文件 ##xargs，允许你对输出执行其他某些命令

whereis python |xargs rm -frv

验证删除，返回无结果说明清除干净

whereis python

3.删除yum

rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps

whereis yum |xargs rm -frv

验证删除，返回无结果说明清除干净

whereis yum

4.创建一个文件夹

创建

mkdir /usr/local/src/python-yum

切换到文件夹下面

cd /usr/local/src/python-yum

查看自己系统的版本，根据自己系统版本去下载对应的包

cat /etc/redhat-release

镜像软件下载地址 ：http://mirrors.ustc.edu.cn/centos/（后面接版本os/x86_64/Packages）

执行下载代码下载相关所需的文件（如果wget命令也没安装的话，只能到网站上面一个个下载下来拷贝到centos中，然后再运行）

wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/lvm2-python-libs-2.02.187-6.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/libxml2-python-2.9.1-6.el7.5.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-libs-2.7.5-89.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-ipaddress-1.0.16-2.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-backports-1.0-8.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-2.7.5-89.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-setuptools-0.9.8-7.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/python-chardet-2.2.1-3.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/rpm-python-4.11.3-45.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/yum-utils-1.1.31-54.el7_8.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/yum-plugin-aliases-1.1.31-54.el7_8.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-54.el7_8.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm

5.下载好之后安装
rpm -Uvh --replacepkgs lvm2-python-libs*.rpm --nodeps --force
rpm -Uvh --replacepkgs libxml2-python*.rpm --nodeps --force
rpm -Uvh --replacepkgs python*.rpm --nodeps --force
rpm -Uvh --replacepkgs rpm-python*.rpm yum*.rpm --nodeps --force
（–nodeps --force）的意思是强制安装，不管依赖环境的问题