原因为升级python后新建了软连接指向了新版本，除非同时升级yum不然无法使用。需要手动更改报错文件指向新版本后即可解决。
[root@localhost pdserving]# yum install -y tree File "/usr/bin/yum", line 30 except KeyboardInterrupt, e: ^
# 查看路径 [root@localhost pdserving]# whereis python python: /usr/bin/python /usr/bin/python2.7 /usr/lib/python2.7 /usr/lib64/python2.7 /etc/python /usr/include/python2.7 /usr/local/python3.8 /usr/local/python3.7 /usr/share/man/man1/python.1.gz [root@localhost pdserving]# /usr/bin/python -V Python 3.7.4 [root@localhost pdserving]# /usr/bin/python2.7 -V Python 2.7.5
修改：/usr/bin/yum
# 将 第一行的路径改正确就可以了。 [root@localhost pdserving]# vi /usr/bin/yum #!/usr/bin/python2.7 import sys try: import yum except ImportError: print >> sys.stderr, """\
修改：/usr/libexec/urlgrabber-ext-down
[root@localhost pdserving]# yum -y install tree 已加载插件：fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.ustc.edu.cn * extras: mirrors.ustc.edu.cn * updates: mirrors.ustc.edu.cn 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 [root@localhost pdserving]# vi /usr/libexec/urlgrabber-ext-down #! /usr/bin/python2.7 # A very simple external downloader # Copyright 2011-2012 Zdenek Pavlas
