No module named yum解决办法

    （1）错误提示：

[root@gflinux4 ~]# yum -y install kernel-debuginfo-common-2.6.18-238.el5

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:

2.7.8 (default, Oct 31 2014, 09:32:25) 

[GCC 4.1.2 20080704 (Red Hat 4.1.2-50)]

If you cannot solve this problem yourself, please go to 

the yum faq at:

  http://wiki.linux.duke.edu/YumFaq

     （2）解决办法

    yum是python的一个模块，在安装python时会自动安装后。

    python 的位置：

[root@gflinux4 ~]# python

Python 2.7.8 (default, Oct 31 2014, 09:32:25) 

[GCC 4.1.2 20080704 (Red Hat 4.1.2-50)] on linux2

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

>>> exit

Use exit() or Ctrl-D (i.e. EOF) to exit

>>> 

[root@gflinux4 ~]# whereis python

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

    查看python的安装路径

[root@gflinux4 ~]# cd /usr/local/python/bin/

[root@gflinux4 bin]# ll

total 4488

-rwxr-xr-x 1 root root     108 Oct 31 09:33 2to3

-rwxr-xr-x 1 root root     314 Nov  3 10:26 easy_install

-rwxr-xr-x 1 root root     322 Nov  3 10:26 easy_install-2.7

-rwxr-xr-x 1 root root     106 Oct 31 09:33 idle

-rwxr-xr-x 1 root root      91 Oct 31 09:33 pydoc

lrwxrwxrwx 1 root root       7 Oct 31 09:34 python -> python2

lrwxrwxrwx 1 root root       9 Oct 31 09:34 python2 -> python2.7

-rwxr-xr-x 1 root root 4535058 Oct 31 09:33 python2.7

-rwxr-xr-x 1 root root    1681 Oct 31 09:34 python2.7-config

lrwxrwxrwx 1 root root      16 Oct 31 09:34 python2-config -> python2.7-config

lrwxrwxrwx 1 root root      14 Oct 31 09:34 python-config -> python2-config

-rwxr-xr-x 1 root root   18554 Oct 31 09:33 smtpd.py

     修改/usr/bin/yum文件的头信息如下：

[root@gflinux4 bin]# vi /usr/bin/yum

#!/usr/bin/python => #!/usr/bin/python2

import sys

try:

    再次运行如下：

[root@gflinux4 ~]# yum

/usr/bin/python: can't open file '=> #!/usr/bin/python2': [Errno 2] No such file or directory

    OK测试成功。