centos7.6删除重新安装python和yum

　　最近在开发一个项目时出现了错误，需要重新安装python和yum，怎么安装呢？随ytkah一起来看看吧。ytkah用的linux分支的centos7.6，各位朋友在下载源的时候要注意版本的区分。现在开始：

　　1.1删除现有python

rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps  ##强制删除已安装程序及其关联
whereis python |xargs rm -frv  ##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  ##验证删除，返回无结果

　　1.2删除现有yum

rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps
whereis yum |xargs rm -frv

　　2.1然后到http://mirrors.ustc.edu.cn/centos/找到对应的centos版本下载相应的包，我的是centos7.6

wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-2.7.5-76.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-devel-2.7.5-76.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-libs-2.7.5-76.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-setuptools-0.9.8-7.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-urlgrabber-3.10-9.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-backports-1.0-8.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-ipaddress-1.0.16-2.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/python-chardet-2.2.1-1.el7_1.noarch.rpm

wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/rpm-python-4.11.3-35.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/yum-utils-1.1.31-50.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-50.el7.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/yum-plugin-aliases-1.1.31-50.el7.noarch.rpm

　　2.2然后分别安装python和yum

rpm -Uvh --replacepkgs python*.rpm
rpm -Uvh --replacepkgs rpm-python*.rpm yum*.rpm

　　如果提示libxml2-python is needed by yum-utils-1.1.31-50.el7.noarch那么要先安装libxml2-python

wget http://mirrors.ustc.edu.cn/centos/7.6.1810/os/x86_64/Packages/libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm

　　然后执行

rpm -Uvh --replacepkgs libxml2-python*.rpm

　　3运行python进行测试，直接输入python

python
yum update