Python - OOP - Classes, Methods, Attributes, Composition, Inheritance

Ever wanted to see someone coding a few standard classes in python, talking about it and debugging? Well, search no more - here it comes!
In this video, I am "solving" three problems from the book "Python Workout - 50 ten-minute exercises", trying to debug my way around it.
Contents:
Writing the basic tests - 1:06
Basic Python Class - 2:11
self.__repr__() method - 15:00
list comprehension in class - 18:49
some unplanned debugging - 29:00
methods over collections of classes, in another class - 42:58
happy end, when everything works as expected - 49:00
Jupyter Notebook in GitHub:
github.com/Vit...
VitoshAcademy article:
www.vitoshacad...
Book:
www.manning.co...

[@ousmanetall1286]

a confused lesson

[@vitoshacademy]

Thanks for the feedback.
Can you please share which part of the lesson was the most confusing one, so I can try to improve it the next time?