yum 报错

今天在虚拟机上执行yum -y install命令遇到错误，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:
2.7.4 (default, Sep 10 2013, 12:19:14) 
[GCC 4.1.2 20080704 (Red Hat 4.1.2-52)]


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


yum和Python是依赖关系，yum是python的模块，由于上次更新了Python版本导致这次的问题发生。。

解决办法：
    [root@nginx1 boot]# python
Python 2.7.4 (default, Sep 10 2013, 12:19:14) 

然后修改yum
 vi /usr/bin/yum

修改头#!/usr/bin/python  => #!/usr/bin/python2.4
再次运行就OK了。