升级python导致yum命令无法使用

错误信息：

[root@aliyun /]# yum
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named yum

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:
2.7.8 (default, Dec  3 2014, 08:48:50) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)]

If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq
  

 

查看yum版本：

[root@aliyun /]# rpm -qa|grep yum
yum-3.2.29-60.el6.centos.noarch
yum-metadata-parser-1.1.2-16.el6.x86_64
PackageKit-yum-0.5.8-23.el6.x86_64
yum-plugin-fastestmirror-1.1.30-30.el6.noarch
PackageKit-yum-plugin-0.5.8-23.el6.x86_64
yum-utils-1.1.30-30.el6.noarch
yum-plugin-security-1.1.30-30.el6.noarch

 

查看python版本：

[root@aliyun /]# whereis python
python: /usr/bin/python /usr/bin/python2.6 /usr/lib/python2.6 /usr/lib64/python2.6 /usr/include/python2.6 /usr/local/python2.7 /usr/share/man/man1/python.1.gz

 

查找yum文件,并编辑此py文件

[root@aliyun /]# which yum
/usr/bin/yum

 

再次运行yum，成功运行。

至此，修复成功。