I will try to make a better lecture. Thank you for your kind words. The reason why I did not disclose the Jupyter notebook at the beginning of the lecture but posted it at the end of the lecture is that if I provided notes at the beginning of the lecture, more than half of the students would never code the code directly. They would just copy and paste it or just look at it and run it and move on, so I did not even mention it in the lecture. ^^;;