yumのSyntaxError「KeyboardInterrupt」「except yum.Errors.RepoError」が出た時の対処法

File "/usr/bin/yum", line 30
except KeyboardInterrupt, e:
^
SyntaxError: invalid syntax

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

File "/usr/bin/yum-config-manager", line 133
except yum.Errors.RepoError, e:
^
SyntaxError: invalid syntax

ls -l /usr/bin/python 

[root@localhost ~]# ls -l /usr/bin/python
lrwxrwxrwx. 1 root root 24 Jul 16 20:40 /usr/bin/python -> /etc/alternatives/python
[root@localhost ~]# ls -l /etc/alternatives/python
lrwxrwxrwx. 1 root root 29 Jul 16 20:40 /etc/alternatives/python -> /usr/local/python/bin/python3

#!/usr/bin/python2.7 
import sys
try:
import yum
except ImportError:
print >> sys.stderr, """\
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

#! /usr/bin/python2.7
# A very simple external downloader
# Copyright 2011-2012 Zdenek Pavlas

# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.

#!/usr/bin/python2.7 -tt

import os, os.path
import sys
import re
import yum
sys.path.insert(0,'/usr/share/yum-cli')