The lecture was good, so I finished it in no time. If you look at it in detail, Python is a difficult language, but I think the barrier to entry is low. So I always used it without thinking, and I missed the basics. I'm learning the basics through this lecture. ㅎㅎ Since I learned how to write a class, how about teaching how to write a Python module? Even to the point of making it installable with pip?! Anyway, thank you.