Yum reports "No module named rpm"

["Cameron Beattie" <kjcsb@xxxxxxxxxxxx>]

yum has become corrupted in the process of upgrading to FC4.

yum info
There was a problem importing one of the Python modules required to run yum. 
The error leading to this problem was:
  No module named rpm
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:
2.4.1 (#1, May 16 2005, 15:19:29)
[GCC 4.0.0 20050512 (Red Hat 4.0.0-5)]

python
import rpm
ImportError: No module named rpm

rpm -q python
python-2.4.1-2

rpm -q rpm
rpm-4.3.2-21

rpm -q rpm-python
rpm-python-4.3.2-21

Could anyone suggest the best way to resolve this?

Thanks

Cameron