yum got an error ImportError: No module named urlgrabber.grabber

Original text: https://www.cnblogs.com/zhouxinfei/p/7895532.html

root@iZ23t4pnz63Z ~]# yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyuncs.com
 * epel: mirrors.aliyuncs.com
 * extras: mirrors.aliyuncs.com
 * updates: mirrors.aliyuncs.com
Traceback (most recent call last):
  File "/usr/libexec/urlgrabber-ext-down", line 22, in <module>
    from urlgrabber.grabber import \
ImportError: No module named urlgrabber.grabber
Traceback (most recent call last):
  File "/usr/libexec/urlgrabber-ext-down", line 22, in <module>
    from urlgrabber.grabber import \
ImportError: No module named urlgrabber.grabber

vi /usr/libexec/urlgrabber-ext-down

Change the python in the head to the same as in /usr/bin/yum