class User(object):
    def __init__(self, name, email):
        self.name = name
        self.email = email
        self.books = {}

    def get_email(self):
        return self.email

    def change_email(self, address):
        self.email = address
        print("Your email has been updated to " + address)

    def __repr__(self):
        return "User: {}, email: {}, books read: {}".format(self.name, self.email, self.books)

    def __eq__(self, other_user):
        return self.name == other_user.name and self.email == other_user.email

    def read_book(self, book, rating = None):
    	#self.books = {}
    	self.books.update({book : rating})
    	return self.books

    def get_average_rating(self):
    	for value in self.books:
    		average = sum(self.books)/len(self.books)
    	return average



class Book(object):
	def __init__(self, title, isbn):
		self.title = title
		self.isbn = isbn
		self.ratings = []

	def get_title(self):
		return self.title

	def get_isbn(self):
		return self.isbn

	def set_isbn(self, new_isbn):
		self.isbn = new_isbn
		print("This book's ISBN has been updated to " + str(new_isbn))

	def add_rating(self, rating):
		if rating > 0 < 4:
			self.ratings.append(rating)
		else:
			print("Invalid Rating")

	def __eq__(self, other_book):
		return self.title == other_book.title and self.isbn == other_book.isbn

	def get_average_rating(self):
		for value in self.ratings:
			average = sum(self.ratings)/len(self.ratings)

	def __hash__(self):
		return hash((self.title, self.isbn))


class Fiction(Book):
	def __init__(self, title, author, isbn):
		super().__init__(title, isbn)
		self.author = author

	def get_author(self):
		return self.author

	def __repr__(self):
		return "{} by {}".format(self.title, self.author)

class Non_Fiction(Book):
	def __init__(self, title, subject, level, isbn):
		super().__init__(title, isbn)
		self.subject = subject
		self.level = level

	def get_subject(self):
		return self.subject

	def get_level(self):
		return self.level

	def __repr__(self):
		return "{}, a {} manual on {}".format(self.title, self.level, self.subject)




user1 = User("Sarah Lane", "sarahlane@gmail.com")
user2 = User("Sarah Lane", "saralane@gmail.com")
print(user1)
print(user1.get_email())
user1.change_email("sarah_help_me@gmail.com")
print(user2)
print(user2.__eq__(user1))
book1 = Book("Coraline", 9780380807345)
book2 = Book("The Witch-cult in Western Europe", 9781477456965)
book2.set_isbn(123)
fict1 = Fiction("Coraline", "Neil Gaiman", 9780380807345)
print(fict1)
nonfict1 = Non_Fiction("Society of Mind", "Artificial Intelligence", "beginner", 134567)
print(nonfict1)