This is a must-take course to move from functional programming to class-oriented object-oriented programming. In some ways, it is more important than coroutines and Asyncio, so I regret not taking this course sooner and that it is written as if it is difficult content. I regret why I only found out now that Python can be programmed like C#. This is definitely not an intermediate-advanced course. It is one of the basic grammars of Python that is more important than magic methods.