No module named yum

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升级python之后，执行yum的时候可能出现错误，类似：

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:
2.7.3 (default, Jan 18 2015, 10:32:12)
[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

一般可以通过修改/usr/bin/yum脚本中对python的引用解决。步骤如下：

1、查看当前python版本：

2、查看系统中已安装的python：

3、修改yum脚本

从以上两步骤中得出，之前的python版本应该是2.6，

vi /usr/bin/yum

将#!/usr/bin/python修改为#!/usr/bin/python2.6。再执行yum，恢复正常了。

No module named yum

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原文地址：http://www.cnblogs.com/BlueBreeze/p/4232345.html