Django is a web development platform written in Python. Now there is a book about it, published but also released online under the GFDL: http://www.djangobook.com/
On Amazon it's called "The Definitive Guide to Django: Web Development Done Right" and costs $30.
The website you read it on seems pretty sweet. Yay for links. It seems like there is a good amount of code examples, but no screenshots that I could spot (in a quick glance around).
cheers, Brianna