Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Posted by Matthew Miller
Matthew Miller
3,522 Points

How do I solve the __eq__ problem?

My code is below. I keep getting a syntax error. Thanks!

book.py 
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) 
        return 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)

1 Answer

Megan Amendola
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree seal-36
Megan Amendola
Treehouse Teacher
Megan Amendola
.a{fill-rule:evenodd;}techdegree seal-36
Megan Amendola
Treehouse Teacher

Hi! First, your dunder eq method is missing the : after the parentheses - that's kicking off the syntax error. Second, you should be comparing the author and title of this book to the other book that is being passed in. So self.author == other.author for author and the same for the title.