The library can store up to 100 books. Each book has information of title, author, year, and a borrowed status (true or false). The library allows adding new books to it, checking out a book, and returning a book. We assume different books have different titles in the library.

class Books(object):

   books_count = 0

   books = {}

   #classmethod

   def book_count(cls):

       cls.books_count +=1

   #classmethod

   def add(cls, title, author, year, status):

       if cls.books_count < 100:

           cls.book_count()

           cls.books[title] = [author, year, status]

       else:

           print("Book register has reached it's limit.")

   #classmethod

   def check(cls, book_name):

       return cls.books.get(book_name)

please replace the '#' with the 'at' sign.

Explanation:

The python class defines several class methods namely; add, check and book_count. The add method adds books to the book dictionary in the class as a class attribute, the check method check for the presents of a book title in the book dictionary while the book_count method adds one to the books_count class variable which checks the dictionary size.

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