Raspberry PI 3 centos7 use the Yum command to error file "/usr/bin/yum", line except Keyboardinterrupt, E:

Error using yum command

File "/usr/bin/yum", line 30
Except Keyboardinterrupt, E:
^
Syntaxerror:invalid syntax

The problem is as follows:

The problem occurs because:
Yum package management is written using python2.x, and after upgrading python2.x to python3.x, the problem occurs due to Python version syntax compatibility
Workaround:
Modify the Yum configuration file to point the Python version to the previous old version

# vi /usr/bin/yum#!/usr/bin/python2.7

Modify the Urlgrabber-ext-down file to change the Python version

# vi /usr/libexec/urlgrabber-ext-down#!/usr/bin/python2.7

Raspberry PI 3 centos7 use the Yum command to error file "/usr/bin/yum", line except Keyboardinterrupt, E: