Centos 7 python2 升级 python3 后，yum 有问题

[align=center]Centos 7  python2 升级 python3 后，yum 有问题[/align]
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[align=left]1.问题如下：[/align]

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

... ...
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[align=left]2.解决办法：[/align]
[align=left]a)   最简单的方法：将python的软连接 改回为python2 即可；（如：/usr/bin/python ----> /usr/bin/python改回python2的路径）[/align]
[align=left]b)   其他好方法，希望你自己发现告知我，谢谢！
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