newb question: file searching

[jaysherby at gmail.com]

I'm new at Python and I need a little advice.  Part of the script I'm
trying to write needs to be aware of all the files of a certain
extension in the script's path and all sub-directories.  Can someone
set me on the right path to what modules and calls to use to do that?
You'd think that it would be a fairly simple proposition, but I can't
find examples anywhere.  Thanks.