Is there a good Python GUI shell?

Question

I saw this the other day (scroll all the way down to see some of the clever stuff):

http://www.mono-project.com/docs/tools+libraries/tools/repl/

Answer 1

One project I'm aware of that provides similar features (inline plotting, customisable rendering) is Reinteract. Another (though possibly a bit heavyweight for general usage) is SAGE which provides functionality for web-based notebooks.

These aren't quite shells - they're designed more as a mathematical notebook (so for instance, you can modify an earlier result and have the change propogate to later calculations), but they're close to what you're looking for, and could probably be modified to be used as such.