python升级导致yum无法使用

场景1： python2.7的运行环境正常

只是/usr/bin/python 软连接到了最新安装的python版本非2.7版本

直接修改/bin/yum文件，头改成/usr/bin/python2.7即可

场景2：python2.7的运行环境无法使用

如：site-packages相关包无法使用

修改卸载掉相关rpm包，然后重新安装

查看当前系统安装的yum相关rpm包

rpm -qa | grep yum 

卸载几个比较主要的rpm

rpm -e --nodeps yum-plugin-fastestmirror-1.1.31-40.el7.noarch

rpm -e --nodeps yum-metadata-parser-1.1.4-10.el7.x86_64

rpm -e --nodeps yum-3.4.3-150.el7.centos.noarch

重新安装python相关的rpm包

python-2.7.5-86.el7.x86_64.rpm 

python-iniparse-0.4-9.el7.noarch.rpm 

python-urlgrabber-3.10-9.el7.noarch.rpm

rpm -ivh python-*.rpm    -e --nodeps   其中  -e --nodeps 强制安装

重新安装yum相关的rpm包

yum-3.4.3-163.el7.centos.noarch.rpm 

yum-metadata-parser-1.1.4-10.el7.x86_64.rpm 

yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm

rpm -ivh yum-*.rpm

rpm包链接

http://centos.ustc.edu.cn/centos/7/os/x86_64/Packages/或http://mirrors.163.com/centos/7/os/x86_64/Packages/

如果还是出现类似如下的错误，安装相关的包即可

There was a problem importing one of the Python modules

required to run yum. The error leading to this problem was:

No module named urlgrabber

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:

2.7.5 (default, Jun 20 2019, 20:27:34)

[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)]

If you cannot solve this problem yourself, please go to

the yum faq at:

http://yum.baseurl.org/wiki/Faq