Centos7使用YUM进行install或update出现KeyboardInterrupt错误

### 错误信息

File "/usr/lib/python2.7/site-packages/urlgrabber/grabber.py", line 1517, in _do_perform
raise KeyboardInterrupt

### 解决方案 ###
### 1.打开文件:
/usr/lib/python2.7/site-packages/urlgrabber/grabber.py

### 2.在文件的1510行左右找到下面这句代码:
elif errcode in (42, 55, 56):

### 修改为:
elif errcode == 42:

### 保存退出
ESC
:wq

### 重新使用yum