默认python2.7清除之后，yum受到影响
那就先清理一波吧
rpm -qa |grep python |xargs rpm -ev --allmatches --nodeps rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps
python、yum通通删掉重装
使用官方镜像源： http://vault.centos.org/7.4.1708/os/x86_64/Packages/
首先确认一下系统自带的yum、python已经删除干净
wget https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-backports-ssl_match_hostname-3.4.0.2-4.el7.noarch.rpm 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-ipaddress-1.0.16-2.el7.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/python-chardet-2.2.1-1.el7_1.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/rpm-python-4.11.3-25.el7.x86_64.rpm wget https://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-42.el7.noarch.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/libxml2-python-2.9.1-6.el7_2.3.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 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/yum-plugin-aliases-1.1.31-42.el7.noarch.rpm wget https://vault.centos.org/7.4.1708/os/x86_64/Packages/lvm2-python-libs-2.02.171-8.el7.x86_64.rpm wget https://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-utils-1.1.31-42.el7.noarch.rpm wget https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-setuptools-0.9.8-7.el7.noarch.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/python-iniparse-0.4-9.el7.noarch.rpm wget https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-backports-1.0-8.el7.x86_64.rpm wget https://vault.centos.org/7.4.1708/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
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
升级到python新版本
wget https://www.python.org/ftp/python/3.9.1/Python-3.9.1.tgz暑期编程PK赛 得CSDN机械键盘等精美礼品！
