I honestly don’t know what to do anymore

class Book:
    def __init__(self, author, title):
        self.author = author
        self.title = title
    def __str__(self):
        return f'{self.author}, {self.title}'
    def __eq__(self, other):
        return self.author == other.author and self.title == other.title

from book import Book
class Bookcase:
    def __init__(self):
        self.books = []
    def add_books(self, book):
        self.book.append(book)

    def __iter__(self):
        yield from self.books

from book import Book


class BookCase:
    def __init__(self):
       self.books = []

    def add_books(self, book):
        self.books.append(book)