Linux_yum / Python 報錯

原文地址 ：  https://www.52os.net/articles/no-module-named-yum-issue.html

伺服器是centos 5.9 64位的系統，因為好幾個人一起用，不清楚其它人做了什麼。
任何yum操作都會報錯，錯誤資訊如下：

[root@LB1603 log]# yum --versionThere was a problem importing one of the Python modulesrequired to run yum. The error leading to this problem was:No module named yumPlease install a package which provides this module, orverify that the module is installed correctly.It's possible that the above module doesn't match thecurrent version of Python, which is:2.7 (r27:82500, Sep  9 2014, 04:09:22) [GCC 4.1.2 20080704 (Red Hat 4.1.2-54)]If you cannot solve this problem yourself, please go to the yum faq at:http://wiki.linux.duke.edu/YumFaq

錯誤原因：在yum 的faq中提到，yum是python的一個模組，如果yum所依賴的python版本不一致，就會出現這個問題。

先看一下python的版本：

[root@LB1603 log]# whereis pythonpython: /usr/bin/python /usr/bin/python.bak /usr/bin/python2.4 /usr/lib/python2.4 /usr/local/bin/python2.7 /usr/local/bin/python2.7-config /usr/local/bin/python /usr/local/lib/python2.7 /usr/include/python2.4 /usr/share/man/man1/python.1.gz

有兩個版本，分別試著匯入一下yum包：

root@LB1603 log]# pythonPython 2.7 (r27:82500, Sep  9 2014, 04:09:22) [GCC 4.1.2 20080704 (Red Hat 4.1.2-54)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> import yum Traceback (most recent call last):File "<stdin>", line 1, in <module>ImportError: No module named yum

提示 No module named yum 和直接運行yum的報錯一致，換個版本試下：

[root@LB1603 log]# python2.4 Python 2.4.3 (#1, Jan  9 2013, 06:47:03) [GCC 4.1.2 20080704 (Red Hat 4.1.2-54)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> import yum

成功匯入了，原因找到了，解決方案很簡單：

vim /usr/bin/yum

把開頭 #!/usr/bin/python 改為 #!/usr/bin/python2.4 儲存退出即可。

在python的路徑中看到有一個/usr/bin/python.bak的備份檔案，看下了下版本是python2.4，基本上可以肯定是有人升級了python，導致了這個問題

參考文章：
http://blog.csdn.net/ei__nino/article/details/8495295
http://yum.baseurl.org/wiki/Faq