升级python后yum出问题的解决办法

以前用的是python2.5，前又装了个2.6（我其实对版本特性不了解，只是怀疑拿到的一段代码中的某个东东是2.6里有而2.5里没有，瞎折腾。。。），之后yum就出问题了。。运行yum时提示如下：
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:
2.6.2 (r262:71600, Sep 22 2009, 03:42:24)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-33)]

If you cannot solve this problem yourself, please go to
the yum faq at:
 
 

折腾了半天，最后的修改方案如下，修改/usr/bin/yum的第一行“#!/usr/bin/python”为"#!/usr/bin/python2.5"。。（/usr/bin/python2.5为我在升级之前备份的python 2.5的执行文件），最后搞定。