python2.6升级2.7导致yum无法使用 No module named yum
这里有解决方法：https://teddysun.com/473.html
记住旧版本 Python 2.6.6 的重要路径如下所示，在运行 yum 命令的时候，会提示你哪个 module 不存在，不存在的我们就去旧版本的路径下找，一定能找到的。找到后，复制到新版本 Python 的路径 /usr/local/lib/python2.7/site-packages/ 下即可。
/usr/lib/python2.6/site-packages/ /usr/lib64/python2.6/site-packages/
cp -r /usr/lib/python2.6/site-packages/yum /usr/local/lib/python2.7/site-packages/ cp -r /usr/lib/python2.6/site-packages/rpmUtils /usr/local/lib/python2.7/site-packages/ cp -r /usr/lib/python2.6/site-packages/iniparse /usr/local/lib/python2.7/site-packages/ cp -r /usr/lib/python2.6/site-packages/urlgrabber /usr/local/lib/python2.7/site-packages/ cp -r /usr/lib64/python2.6/site-packages/rpm /usr/local/lib/python2.7/site-packages/ cp -r /usr/lib64/python2.6/site-packages/curl /usr/local/lib/python2.7/site-packages/ cp -p /usr/lib64/python2.6/site-packages/pycurl.so /usr/local/lib/python2.7/site-packages/ cp -p /usr/lib64/python2.6/site-packages/_sqlitecache.so /usr/local/lib/python2.7/site-packages/ cp -p /usr/lib64/python2.6/site-packages/sqlitecachec.py /usr/local/lib/python2.7/site-packages/ cp -p /usr/lib64/python2.6/site-packages/sqlitecachec.pyc /usr/local/lib/python2.7/site-packages/ cp -p /usr/lib64/python2.6/site-packages/sqlitecachec.pyo /usr/local/lib/python2.7/site-packages/
原来是：
#!/usr/bin/python
改为下图：
今天用yum安装软件的时候出现如下错误:
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:
If you cannot solve this problem yourself, please go to the yum faq at:
http://wiki.linux.duke.edu/YumFaq
yum 错误，搜索一番后知道是yum和Python是依赖关系，yum是python的模块，所以采用以下解决方案：
系统python的当前版本 Python 2.7
肯定是yum的版本与当前python的版本不一致造成的
所以修改yum的配置，修改文件： vim /usr/bin/yum
修改头#!/usr/bin/python => #!/usr/bin/python2.6
dd
