To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
This is a comprehensive python book. THough it may be long, it is worth the effort. I am a beginner with no programming background, I hope that I will gain something out of it. The only disappointment is the book is dusty when it arrive, I expected a clean copy. That explained 4 stars. If not, it is completely 5 stars and beyond.