同事手快误删python2，造成python2和yum不能使用。
cat /etc/redhat-release查看下如果刚好是centos7.9.2009可以通过以下操作恢复。
1、把python、yum卸载干净
# 删除已安装程序和它的关联项
rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps
rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps2、下载安装rpm包（包的源文件下载地址：http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/）
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
yum-3.4.3-168.el7.centos.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm
yum-plugin-protectbase-1.1.31-54.el7_8.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-54.el7_8.noarch.rpm
python-iniparse-0.4-9.el7.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
python-kitchen-1.1.1-5.el7.noarch
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
rpm-python-4.11.3-48.el7_9.x86_64
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/rpm-python-4.11.3-45.el7.x86_64.rpm
python-pycurl-7.19.0-19.el7.x86_64.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
python-chardet-2.2.1-3.el7.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-chardet-2.2.1-3.el7.noarch.rpm
python-rpm-macros-3-34.el7.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-rpm-macros-3-34.el7.noarch.rpm
python-2.7.5-89.el7.x86_64.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-2.7.5-89.el7.x86_64.rpm
python-devel-2.7.5-89.el7.x86_64.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-devel-2.7.5-89.el7.x86_64.rpm
python2-rpm-macros-3-34.el7.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python2-rpm-macros-3-34.el7.noarch.rpm
python-libs-2.7.5-89.el7.x86_64.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-libs-2.7.5-89.el7.x86_64.rpm
python-urlgrabber-3.10-10.el7.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm
python-srpm-macros-3-34.el7.noarch.rpm
http://mirror.centos.org/centos/7.9.2009/os/x86_64/Packages/python-srpm-macros-3-34.el7.noarch.rpm3、依次执行安装命令文章来源：https://www.toymoban.com/news/detail-604957.html
rpm -Uvh --replacepkgs python*.rpm
rpm -Uvh --replacepkgs rpm-python*.rpm yum*.rpm4、检查文章来源地址https://www.toymoban.com/news/detail-604957.html
pyhon -V
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