This is by far the most useful book I’ve read on Data Science and Machine Learning. I’m teaching myself Python, Statistics and Data Science in my spare time, and the book has helped me greatly.
The book clearly explains in depth the maths and behind the algorithms, and then follows up with examples and exercises in Python. And it looks lovely, with beautifully rendered colour diagrams.
I’ve read a few books on the subject, but have found them to be too superficial. This is much more rigorous, and I expect it will be my main study text for quite some time.