This book is a "must-have" by all means. It gives you a nice introduction to Python. After the introduction, real programming examples are showed and not only gives you an insight of what the language can do but introduces the reader to the mindset behing Python.
This book is also displaying a lot of useful tools: shelves, fileinput and so on. These modules are part of the standard library and are very helpfull for many situations. It helps you get more and more productive when using Python.
This book covers everything from SQL-requests, to file handling, paths manipulations and basic GUI programming with wxWidgets.
This book led me to have Python as my first-choice language for many applications.