Week-1 Exercise 1: possible bug i,e extra lines?

Course Q&A Math for Machine Learning Calculus for Machine Learning and Data Science
1

This seems to be extra lines.

prices_A = None(None).astype('None')
prices_B = None(None).astype('None')
2

What do you mean by extra lines? Often times, when most of the structure of the solution code is alreasy given, your task is to simply replace the “None” with something else that will make the code work.

3

thanks @bs80 , it was misunderstanding on my part