search_books method of the Bookstore class you implemented in the previous unit so it has an iterator-like interface.
Instead of returning a list with the results,
create a generator/iterator that behaves with the Iterator API:
store = BookStore()
Both these pieces of code should work and be equivalent:
# Using a for loop results = store.search_books(title="raven") for book in results: print(book) # Invoking next directly results = store.search_books(title="raven") print(next(result)) print(next(result))