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Python Basic Object-Oriented Python Emulating Built-ins Emulating Built-ins

Add a __eq__ method for this book class. It should check if the author and title of the book are the same and return tru

class Book: def init(self, author, title): self.author = author self.title = title

def __str__(self):
    return f"{self.author}, {self.title}"
book.py
class Book:
    def __init__(self, author, title):
        self.author = author
        self.title = title

    def __str__(self):
        return f"{self.author}, {self.title}"
bookcase.py
from book import Book


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

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

2 Answers

this part of the code is an error some how def eq(self, other): if isinstance(other, Book): return self.author == other.author and self.title == other.title return False

Travis Alstrand
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Travis Alstrand
Data Analysis Techdegree Graduate 47,831 Points

Hey there terencelewis ! :wave:

You're super close here! It just needs a little adjustment. The challenge reads "It should check if the author and title of the book are the same and return true if they are and false if they arenโ€™t." So I believe the isinstance check you had in place is what was throwing the answer validation on the back end off.

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):
        if self.author == other.author and self.title == other.title:
            return True
        else:
            return False