今天要用yum安装软件，于是yum install ***，但是报错，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:
If you cannot solve this problem yourself, please go to the yum faq at:
http://wiki.linux.duke.edu/YumFaq
我开始还以为是yum没安装，于是：
#rpm -qa|grep yum
yum-updatesd-0.9-2.el5
yum-metadata-parser-1.1.2-4.el5
yum-utils-1.1.16-21.el5
yum-rhn-plugin-0.5.4-26.el5
yum-security-1.1.16-21.el5
yum-3.2.22-40.el5
# rpm -ivh yum-3.2.22-40.el5
error: open of yum-3.2.22-40.el5 failed: No such file or directory
安装不了，于是网上搜有了一下发现是python依赖错误。修改如下：
#whereis python
python: /usr/bin/python /usr/bin/python2.4 /usr/bin/python.bak /usr/lib/python2.4 /usr/local/bin/python /usr/local/bin/python2.7-config /usr/local/bin/python2.7 /usr/local/lib/python2.7 /usr/include/python2.4 /usr/share/man/man1/python.1.gz
修改文件： vim /usr/bin/yum
修改头#!/usr/bin/python => #!/usr/bin/python2.4
Ok，问题搞定