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yum问题，请高手帮忙看看

大家好，帮忙看看啊，我用yum命令的时候出现如下提示，是什么问题？
[root@localhost local]# yum libexpat1-2.0.1-6mdv2008.1.i586.rpm
Traceback (most recent call last):
  File "/usr/bin/yum", line 22, in ?
    import yummain
ImportError: Bad magic number in /usr/share/yum/yummain.pyc
[root@localhost local]# yum libexpat1
Traceback (most recent call last):
  File "/usr/bin/yum", line 22, in ?
    import yummain
ImportError: Bad magic number in /usr/share/yum/yummain.pyc
[root@localhost local]# yum search libexpat1
Traceback (most recent call last):
  File "/usr/bin/yum", line 22, in ?
    import yummain
ImportError: Bad magic number in /usr/share/yum/yummain.pyc
[root@localhost local]# yum search libexpat
Traceback (most recent call last):
  File "/usr/bin/yum", line 22, in ?
    import yummain
ImportError: Bad magic number in /usr/share/yum/yummain.pyc