This book is a good value. It is a good way to get started with a Pi. Teaches you how to set up the Pi and the basics of programming in Python with example code. I bought this guy's Arduino book too. It was also a good read.
This book isn't comprehensive but it is definitely a good starting point which is what I was looking for. You can get your feet wet and after reading this book you can decide if you want a more comprehensive book and you will also have a better idea of what kind of comprehensive book you need.
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