[grandalf]

I'd recommend sticking with the basic webapp handlers in python and not trying to learn django, etc.

Just write a simple app that you think would be fun... maybe a blog app, or a simple forum, etc.

Python is pretty easy and the python libs have very easy to understand source (and decent documentation) in case you get confused.

If you really have zero experience with web apps, you might first want to play around with Sinatra a bit on your laptop, but the webapp framework on app engine is actually fairly similar to sinatra, so either one would be fine.