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There are many books out there on Data Science, Machine Learning and Data Analytics. I can think of none that understand the subject so well they make it easy for the reader to understand. Einstein once said if you can't explain something in simple terms you don't really understand it. Well O'Neil and Schutt pass the Einstein test. Other books I've read on the subject are either written by a computer scientist who is light on maths and so they leave the maths opaque. Or they are a mathematicians who are strong on stats and light on programming. O'Neil and Schutt are strong in both and as the title would suggest its about doing Data Science rather than the academic theory of Data Science and Machine Learning. Another thing I love about this book is it debunks the jargon. Very refreshing. Whoever you are at whatever level this is the last word in Data Science. I would consider it perfect if it included code for Python too. It doesn't it's R and the R code requires updating since publication but that's easily done if you are interested. Can't recommend this book more highly. The essential read for the subject.