centos7.3中python2.7升级到python3.6问题

升级后yum无法使用,报错如下
File "/bin/yum", line 30
except KeyboardInterrupt, e:
^
SyntaxError: invalid syntax

File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax


解决方法
修改以下三个文件
/usr/bin/yum
/usr/libexec/urlgrabber-ext-down
/usr/bin/yum-config-manager

将开头的#!/usr/bin/python改为#!/usr/bin/python2.7

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