The real question, I suppose, is "what is a good technique to find what modules and classes implement or refer to particular names"
You might like to try ctags. I have had a good experience with it. It's not as automatic as I would like - you have to build a cross-reference table before you can use it - and it only finds implementors, not referrers. It integrates with lots of editors, I have used it with TextPad.
http://ctags.sourceforge.net/
Kent -- http://mail.python.org/mailman/listinfo/python-list
