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I believe there was a typo error in the video in the class method part of the code.
In the video, while appending the Books class to the books list, the code is using Book rather than using Books. Please see the code below which I copied from the lecture:
@classmethod def create_bookcase(cls,book_list): books =  for title, author in book_list: books.append(Book(title, author)) #Notice the class name Book but the actual name is Books return cls(books)
I guess I added this post to the wrong forum. sorry,