Linux 执行yum clean all报错File "/usr/bin/yum", line 30 except KeyboardInterrupt, e:

1）错误
执行yum clean all报错File "/usr/bin/yum", line 30 except KeyboardInterrupt, e:
这是因为升级了Python3.6，yum采用python作为命令解释器，系统自带的python解释器为python2.7

[***@localhost]# yum clean all
  File "/usr/bin/yum", line 30
    except KeyboardInterrupt, e:
                            ^
SyntaxError: invalid syntax

2）解决方法
修改/usr/bin/yum文件中的第一行为
#!/usr/bin/python 修改成 #!/usr/bin/python2.7

3）保存修改后再次执行yum clean all

[***@localhost yum]# yum clean all
已加载插件：fastestmirror, langpacks
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
正在清理软件源： base centos-sclo-rh epel extras updates
Cleaning up list of fastest mirrors

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