Take a look at KitViewer at http://staffa.wi.mit.edu/people/kelley. This
is a fairly simplistic (though effective for browsing and debugging) GUI
for Metakit databases. The source is available from the site and it uses
wxPython. It should give you a decent example of how to start what you
want to do.
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Gary H. Merrill
Director and Principal Scientist, New Applications
Data Exploration Sciences
GlaxoSmithKline Inc.
(919) 483-8456