linux系统下升级python2.4到2.6版本后，yum不能用了，请问是什么问题？

lyww830

使用yum时的报错：
[root@www ~]# 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:
2.6 (r26:66714, Nov  1 2010, 12:32:10)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)]
If you cannot solve this problem yourself, please go to
the yum faq at:
  http://wiki.linux.duke.edu/YumFaq

python的版本
[root@www ~]# python
Python 2.6 (r26:66714, Nov  1 2010, 12:32:10)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

lyww830

谢谢回复！！