Описать класс с именем «Книга»

class Book:
    def __init__(self, title, author, year, category):
        self.title = title
        self.author = author
        self.year = year
        self.category = category
 
    def __str__(self):
        return f"{self.title} ({self.author}, {self.year}, {self.category})"
 
    def __eq__(self, other):
        return self.category == other.category
 
    def __lt__(self, other):
        return self.category < other.category

class Library:
    def __init__(self, name):
        self.name = name
        self.books = []
 
    def add_book(self, book):
        self.books.append(book)
 
    def find_book_by_author(self, author):
        found_books = []
        for book in self.books:
            if author in book.author:
                found_books.append(book)
        if not found_books:
            print(f"No books found by {author}")
        else:
            for book in found_books:
                print(book)
 
    def sort_books_by_category(self):
        self.books.sort()
        for book in self.books:
            print(book)

library = Library("Central Library")
book1 = Book("The Great Gatsby", "F. Scott Fitzgerald", 1925, "Classic")
book2 = Book("To Kill a Mockingbird", "Harper Lee", 1960, "Classic")
book3 = Book("1984", "George Orwell", 1949, "Dystopian")
book4 = Book("Brave New World", "Aldous Huxley", 1932, "Dystopian")
library.add_book(book1)
library.add_book(book2)
library.add_book(book3)
library.add_book(book4)
 
library.find_book_by_author("Fitzgerald")
# Output: The Great Gatsby (F. Scott Fitzgerald, 1925, Classic)
 
library.find_book_by_author("Orwell")
# Output: 1984 (George Orwell, 1949, Dystopian)
 
library.find_book_by_author("Tolkien")
# Output: No books found by Tolkien
 
library.sort_books_by_category()
# Output:
# The Great Gatsby (F. Scott Fitzgerald, 1925, Classic)
# To Kill a Mockingbird (Harper Lee, 1960,