This b o ok aims to b e a stepping stone on your path to b ecoming a Python master. It helps you to learn faster by making use of the established principles of go o d teaching. It oers you ten to twenty hours of thorough Python training using one of the most ecient learning techniques, called practice testing . Investing this time will kickstart your skills to write, read, and understand Python source co de. The idea is that you solve co de puzzles that start out simple but b ecome more and more complex as you read the b o ok. In essence, you play Python interpreter and compute the output of a co de snipp et in your head. Then you check whether you were right with your guessusing feedback and explanationsto adapt and improve your co ding skills over time. To make this idea a reality, I develop ed the online co ding academy Finxter.com. The next section explains and motivates the advantages of the Finxter methodof puzzle-based learning.