This is it, I've had it with Packt books. This is the third in a row regarding Python that don't ever answer the question "why", even briefly, they just go on and on about different code samples without giving any perspective.

This book is just a printed edition of online poorly written code samples aimed at those that already pretty much know what they're doing. The same people probably already have some of their own code to glance at when in doubt. Speaking about doubt, I doubt anyone needs this book.