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Description of problem:
After updating yum to version 2.1.8-1 from 2.1.6-1 I check for the
version and recieve a error.  Testing further I try to update and
recieve the same error.  

Version-Release number of selected component (if applicable):
yum-2.1.8-1

How reproducible:
Always

Steps to Reproduce:
1.type in yum --version
or
2.type in yum check-update
or
3.type in yum
    

Actual Results:  I recieve a Traceback after all three.  

Expected Results:  1.  I expect yum version to be output
2.  I expect the repositories to be checked
3.  I expect an output of the valid commands for yum

Additional info:

10:01:18 root@/home/verbena $ yum --version
Traceback (most recent call last):
  File "/usr/bin/yum", line 6, in ?
    import yummain
ImportError: No module named yummain
10:01:22 root@/home/verbena $ yum check-update
Traceback (most recent call last):
  File "/usr/bin/yum", line 6, in ?
    import yummain
ImportError: No module named yummain
10:01:28 root@/home/verbena $ yum
Traceback (most recent call last):
  File "/usr/bin/yum", line 6, in ?
    import yummain
ImportError: No module named yummain
10:01:30 root@/home/verbena $