yum出问题了，说什么 No module named yu

＃yum -v
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:
2.4.4 (#1, Dec 19 2006, 11:38:39)
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)]

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://wiki.linux.duke.edu/YumFaq
  
错误代码到此为止。

运行 man yum 后可以显示帮助信息。

使用 rpm -q yum 情况如下：

[root@XFun dl]# rpm -q yum
yum-3.0.1-2.fc6
[root@XFun dl]#

欢迎有类似经验或者大侠们能慷慨解囊相助，小生不胜感激。