將centos 部分程式更新了下，發現再次執行yum 的時候提示 No module named yum

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出錯提示
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

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尋找資料後說是python 版本的問題。
[root@clients ~]# python --version
Python 2.6.5
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[root@clients ~]# whereis python
python: /usr/src/Python-2.6.5/python /usr/bin/python2.4 /usr/bin/python2.6 /usr/bin/python /usr/bin/python2.6-config /usr/lib/python2.4 /usr/lib/python2.6 /usr/local/bin/python2.6 /usr/local/bin/python /usr/local/bin/python2.6-config /usr/local/lib/python2.6 /usr/include/python2.4 /usr/include/python2.6 /usr/share/man/man1/python.1.gz /usr/share/man/man1/python.1
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解決辦法
修改yum檔案
#vi /usr/bin/yum
將 #!/usr/bin/python 修改為  #!/usr/bin/python2.4
再次運行yum，一切正常。