之前因為不小心刪除了cetos下的yum和python。現在需要重新安裝。網上搜索了一些方法，這裡總結了一下。親測有效

****一、解除安裝

1、刪除現有的python

rpm -qa|grep python|xargs rpm -ev –allmatches –nodeps ##強制清除已安裝的程式及其關聯

whereis python |xargs rm -frv ##刪除所有殘餘檔案 ##xargs，允許你對輸出執行其他某些命令

whereis python ##驗證刪除，返回無結果說明清除乾淨

2、刪除現有的yum

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

whereis yum |xargs rm -frv

3、檢查CentOS 7版本

cat /etc/centos-release

****二、安裝

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-2.7.5-58.el7.x86_64.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-libs-2.7.5-58.el7.x86_64.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/rpm-python-4.11.3-25.el7.x86_64.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

wget  https://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm