CentOS yum 提示段错误 (core dumped)解决办法

#!/usr/bin/python2.6
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:
 
   %s
 
Please install a package which provides this module, or
verify that the module is installed correctly.
 
It's possible that the above module doesn't match the
current version of Python, which is:
%s
 
If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq
   
""" % (sys.exc_value, sys.version)
    sys.exit(1)
 
sys.path.insert(0, '/usr/share/yum-cli')
try:
    import yummain
    yummain.user_main(sys.argv[1:], exit_code=True)
except KeyboardInterrupt, e:
    print >> sys.stderr, "nnExiting on user cancel."
    sys.exit(1)

[root@lee ~]# yum -y update
Loaded plugins: fastestmirror, refresh-packagekit
Determining fastest mirrors
 * base: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.tuna.tsinghua.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
base                                                                                                                                           | 3.7 kB     00:00     
base/primary_db                                                                                                                                | 4.4 MB     00:20     
extras                                                                                                                                         | 3.4 kB     00:00     
extras/primary_db                                                                                                                              |  18 kB     00:00     
updates                                                                                                                                        | 3.4 kB     00:00     
updates/primary_db                                                                                                                             | 3.9 MB     00:13     
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package bash.x86_64 0:4.1.2-14.el6 will be updated
---> Package bash.x86_64 0:4.1.2-15.el6_4 will be an update
---> Package bind-libs.x86_64 32:9.8.2-0.17.rc1.el6_4.4 will be updated