Ian Bicking: the old part of his blog

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You might take a look at Python Servlet Engine -- a former colleague of mine developed it with some of my input. It's a simple system, but has a superb system for separating presentation from logic without throwing away reusuable components, has decent debugging, and runs well with mod_python (could be expanded for other systems.) One could expand its capability for cross-platform use.

I've used WingIDE to debug it, and it works well.
Comment on An Ideal Python Web Programming Environment
by Ken Kinder