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CentOS 5.4系统默认Python版本是2.4.3

需要升级到Python 2.5.4,由于yum包管理是用python写的,仅仅单独升级python会导致yum无法使用.

出现这种情况的主要原因在于新安装的Python没有YUM服务所依赖的Packages.

[root@TC-Boss ~]# 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:

2.5.4 (r254:67916, Feb 24 2010, 10:03:49)

[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)]

If you cannot solve this problem yourself, please go to

the yum faq at:
http://wiki.linux.duke.edu/YumFaq
解决方法:

查找yum文件,并编辑此py文件

[root@TC-Boss ~]# which yum

/usr/bin/yum

[root@TC-Boss ~]# vi /usr/bin/yum

将

#!/usr/bin/python

改为:

#!/usr/bin/python2.4

然后保存OK.

还有一种可能也同样会导致无法使用yum，就是/usr/bin下的python、python2、python2.4三个文件一定不能改变。理论上说 yum只是基于python语言，跟版本并没有关系，但是升级过程中确实会出现问题，具体的机制我也不是很清楚。本文出自 “让爱走吧~！” 博客，请务必保留此出处http://ylj798.blog.51cto.com/110701/1061934