Python升级导致yum不能用的解决办法

    今天将rhel6.4默认的python升级到了2.7，然后在使用yum的时候报如下错误：

[root@nortorm ~]# yum repolist
    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:
    2.7.6 (default, Jan 3 2015, 14:09:58)
    [GCC 4.4.6 20120305 (Red Hat 4.4.6-4)]
    If you cannot solve this problem yourself, please go to
    the yum faq at:
    http://yum.baseurl.org/wiki/Faq
[root@nortorm ~]#

yum的wiki文档：
解决办法:

[root@nortorm bin]# pwd
/usr/bin
[root@nortorm bin]# ls python --将之前的2.6版本rename
python python2.6
[root@nortorm bin]# ls python
[root@nortorm bin]# vim /usr/bin/yum --修改环境为之前的版本
#!/usr/bin/python2.6
import sys
try:
import yum
except ImportError:
print >> sys.stderr, """\
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
%s
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:
%s
If you cannot solve this problem yourself, please go to
the yum faq at:

""" % (sys.exc_value, sys.version)
sys.exit(1)
sys.path.insert(0, '/usr/share/yum-cli')
try:
import yummain
yummain.user_main(sys.argv[1:], exit_code=True)
except KeyboardInterrupt, e:
print >> sys.stderr, "\n\nExiting on user cancel."
sys.exit(1)

恢复正常：

[root@nortorm bin]# yum repolist
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
Updating certificate-based repositories.
Unable to read consumer identity
repo id                                                      repo name status
epel                                                         Extra Packages for Enterprise Linux 6 - x86_64                                                      11,199
repolist: 11,199
[root@nortorm bin]#