解决yum升级的问题“There was a problem importing one of the Python modules”

yum命令升级的时候，报出这个错误。

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:
2.7.5 (default, Sep  3 2013, 23:16:48)
[GCC 4.6.3 20120306 (Red Hat 4.6.3-2)]

解决方法：

<span style="font-size:18px;"> sudo vim /usr/bin/yum

#修个python所在的路径，例如
#/usr/local/bin/python2.6</span>

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