升级python版本号后，执行yum

# yum -y install openssl

提演示样例如以下:

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:

2.7.3 (default, Jul 15 2014, 16:52:36) 

[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



分析应该是yum和Python是依赖关系，yum是python的模块，所以须要改动yum来解决:

1. 查看python的安装路径

# python

Python 2.7.3 (default, Jul 15 2014, 16:52:36) 

[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>>

# whereis python

python: /usr/bin/python2.4 /usr/bin/python /usr/bin/python2.6 /usr/lib/python2.4 /usr/local/bin/python 

/usr/local/bin/python2.6-config /usr/local/bin/python3.3-config /usr/local/bin/python3.3 /usr/local/bin/python3.3m 

/usr/local/bin/python3.3m-config /usr/local/bin/python2.6 /usr/local/lib/python2.4 /usr/local/lib/python3.3 

/usr/local/lib/python2.6 /usr/include/python2.4 /usr/share/man/man1/python.1.gz



2. 改动yum

# vim /usr/bin/yum

将 #!/usr/bin/python 改成  #!/usr/bin/python2.4

【保存并退出】



3. 再測试yum安装，成功；