CentOS升级python后遇到问题解决办法

升级后yum不能用解决：

http://blog.csdn.net/ei__nino/article/details/8495295

easy_install不能用：

http://stackoverflow.com/questions/22148144/python-importerror-no-module-named-pkg-resources

ImportError: No module named urlgrabber.grabber

http://www.zhihu.com/question/31522501

urllib2.URLError: <urlopenerror unknown url type: https>

http://blog.csdn.net/gekkoou/article/details/50781137