Problems with installing Yum on Fedora Core 4

"There is a problem importing one of the Python modules" : ever faced this error after installing an running yum. Well I faced that. And searched on Google for it. But in vain. Most results suggested the usual missing packages:

libxml2-python, python-sqlite, or python-elementtree

I tried installing all of them and no use. Then did lot of finding around and finally i tried to install other package managers. Finally I cam across a yum rpm package at rpmfind.net and while installing I got the dependency error for urlgrabber (http://linux.duke.edu/projects/urlgrabber/). Installed that and all was fine !!!