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 Object-Oriented Python Advanced Objects Double

Posted by Kyle Calica
Kyle Calica
5,955 Points

For Double class I keep getting, TypeError: int.__new__(X): X is not a type object (int) [Solved]

I can't figure out why this isn't working. It's also not asking me to multiply by two but when I do still the same issue.

doubler.py 
class Double(int):
    def __new__(self, *args, **kwargs):
        return int.__new__(*args, **kwargs)
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

Correct! Since the __new__ method is called first and is responsible for creating the class instance, there is no self yet to be referenced. After __new__ creates the instance, it calls __init__ using the newly created instance as the value of __init__.self

1 Answer

Kyle Calica
Kyle Calica
5,955 Points
Kyle Calica
Kyle Calica
5,955 Points

solved! 

class Double(int):
    def __new__(self, *args, **kwargs):
        return int.__new__(*args, **kwargs)

No need for self in __new__