File "/bin/yum", line 30 except KeyboardInterrupt, e:
由于yum包使用python2*等开发,修该为环境修改python3以后有问题,
修改文件`/usr/bin/yum`、`/usr/libexec/urlgrabber-ext-down`将头中相应python更改成`#!/usr/bin/python2.7`