报错情况：
There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: No module named sqlite Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is:
1.除了误删也可能升级或卸载Python导致
1、查看已安装python的版本，可能是当前系统存在多个python导致 [root@test ~]# whereis python python: /usr/bin/python2.6 /usr/bin/python /usr/bin/python2.6-config /usr/lib/python2.6 /usr/lib64/python2.6 /usr/include/python2.6 /usr/share/man/man1/python.1.gz [root@test ~]# vi /usr/bin/yum 将 #!/usr/bin/python 修改为 #!/usr/bin/python2.6 如果是源代码安装的，默认路径是/usr/local/bin/python2.6,做个软链接即可 rm -rf /usr/bin/python ln -s /usr/local/bin/python2.6 /usr/bin/python
2.其他原因：完全重装python和yum
解决：
1）卸载python
rpm -qa|grep python|xargs rpm -e --allmatches --nodeps whereis python|xargs rm -fr
2）卸载yum
rpm -qa|grep yum|xargs rpm -e --allmatches --nodeps whereis yum|xargs rm -fr
新建个文件夹放下载的rpm包
mkdir /usr/local/src/python cd /usr/local/src/python
#注意一下链接的包版本可能过期，最好到网站寻找新版本包
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/lvm2-python-libs-2.02.177-4.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-libs-2.7.5-68.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-ipaddress-1.0.16-2.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-backports-1.0-8.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-2.7.5-68.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-setuptools-0.9.8-7.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/python-chardet-2.2.1-1.el7_1.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/rpm-python-4.11.3-32.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-utils-1.1.31-45.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-3.4.3-158.el7.centos.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-plugin-aliases-1.1.31-45.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-45.el7.noarch.rpm
wget http://mirrors.163.com/centos/7.5.1804/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm
网站链接：http://mirrors.163.com/centos/7/os/x86_64/Packages/
打开链接后，搜索对应包名下载到新建的文件夹中。
3.下载完成后执行
cd /usr/local/src/python
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
安装完成后输入yum查看能否使用