The author gives a very good review of machine learning in theory or from an algorithmic point of view. You don't see a single line of code, but you will be very familiar with the concepts implemented in ML packages like Sci-kit learn. Actually, it'll help to understand what's done in Python. If Sci-kit learn package is a Python library, this book will help "to explain what the code is doing" (page 7). I think the people who knows ML well can learn a lot from this short book  - it's relevant and up to date. The writing style is straightforward and fun to read!