After you got the basics of Python under your belt, the best way to get a good knowledge of the language and improve your coding skills is to start on a project you are interested in. Maybe an image viewer, a slide show, computer generated random or fractal art, a database for your baseball cards, a story writer, ...

This sticky is dedicated to a list of just such projects.

If you know a good project, please post it here. If you have questions, start your own thread and don't clutter the sticky.