Python升级或降级导致yum命令无法使用

Python升级或降级导致yum命令无法使用

问题描述

[root@cs7 ~]# yum install wget

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:

2.6.9 (unknown, Dec 23 2016, 04:32:34)

[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)]

If you cannot solve this problem yourself, please go to

the yum faq at:

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

分析与解决

yum是基于python编写的

1.查看yum版本

[root@cs7 ~]# rpm -qa |grep yum

yum-plugin-fastestmirror-1.1.31-34.el7.noarch

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

yum-3.4.3-132.el7.centos.0.1.noarch

2.查看python

[root@cs7 ~]# whereis python

python: /usr/bin/python2.7 /usr/bin/python /usr/bin/python2.7-config /usr/bin/python2.6 /usr/bin/python2.6-config /usr/bin/python2.bak /usr/lib/python2.7 /usr/lib/python2.6 /usr/lib64/python2.7 /etc/python /usr/local/bin/python2.6 /usr/local/bin/python2.6-config /usr/local/lib/python2.6 /usr/include/python2.7 /usr/share/man/man1/python.1.gz

果真存在两个python: /usr/bin/python2.7和/usr/lib/python2.6

3.查找编辑yum文件

[root@cs7 ~]# which yum

/usr/bin/yum

[root@cs7 ~]# vi /usr/bin/yum

#!/usr/bin/python

修改为：

#!/usr/bin/python2.7

[root@cs7 ~]#

4.补充

CentOS 6只要修改/usr/bin/yum

CentOS 7需要同时修改/usr/bin/yum以及/usr/libexec/urlgrabber-ext-down同样的Python版本

#!/usr/bin/python

修改为：

#!/usr/bin/python2.7

问题即可解决！