This book is very useful for novices and intermediate programmers, with limited utility for experts. I started out as a relative novice, and found it to be very useful. At the end of each chapter it reviews the functions introduced in the chapter and makes a quick summary of what was covered in the chapter, making it easier for someone with some previous programming experience and who has a vague idea of python syntax to just skim off what they need for the first few chapters, and makes a nice review for someone who was learning the content of the chapter for the first time.
The book progresses in a logical manner – starting out with basic stuff like variables of various kinds input and output, before going to more complex stuff. More or less, it covers all the OO, networking and GUI stuff, and then a bit more, going over things like making extensions to Python and web development. It contains a good amount of example code, and various projects. After reading it, I feel more comfortable with the language.
I would recommend this book to any novice or intermediate programmer, and if you can get your hands on a copy for cheap, it would also help a competent programmer in other languages pick up python quickly. All in all, a good book to have around.