python升级导致yum无法使用的解决办法 /usrbin/yum 和 /usr/bin/yum-updatest

1、报错信息如下：

[root@develop bin]# yum
[root@develop local]# yum -y install prce
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:
2.6.1 (r261:67515, Aug 7 2010, 11:36:17)
[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

错误原因：错误信息描述为 yum 所依赖的python 不相符，请安装相对应的python即可


2、查看yum版本
[root@develop local]# rpm -qa |grep yum
yum-3.2.8-9.el5.centos.1
yum-metadata-parser-1.1.2-2.el5


3、查看python版本

[root@develop local]# whereis python
python: /usr/bin/python2.4 /usr/bin/python /usr/lib/python2.4 /usr/local/bin/python2.6 /usr/local/bin/python2.6-config /usr/local/bin/python /usr/local/lib/python2.6 /usr/share/man/man1/python.1.gz

果然装了两个版本python


4、执行python，查看到使用2.6.1的版本

[root@develop local]# python
Python 2.6.1 (r261:67515, Aug 7 2010, 11:36:17)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

5、猜测yum调用了高版本的python。


6、解决方法：
查找yum和 yum-updatest文件,并编辑此py文件

[root@develop local]# which yum
/usr/bin/yum
[root@develop local]# vi /usr/bin/yum

[root@develop local]# vi /usr/bin/yum-updatest

将
#!/usr/bin/python
改为:
#!/usr/bin/python2.4


然后保存OK.

如果不修改/usr/bin/yum ,则yum无法使用

如果不修改/usr/bin/yum-updatest  会出现如下错误

 File "/usr/sbin/yum-updatesd", line 35, in
    import dbus
ImportError: No module named dbus

当然，修改完后记着

[root@localhost google_appengine]# /sbin/service yum-updatesd restart
Stopping yum-updatesd:                                     [FAILED]
Starting yum-updatesd:                                     [  OK  ]

补充：yum基于python写的。