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 Frustration

Andrei Oprescu
Andrei Oprescu
9,547 Points
Posted by Andrei Oprescu
Andrei Oprescu
9,547 Points

I am getting a RecursionError

I am on this question that says:

Now I want you to make a subclass of list. Name it Liar.

Override the len method so that it always returns the wrong number of items in the list. For example, if a list has 5 members, the Liar class might say it has 8 or 2.

You'll probably need super() for this.

And my code is:

class Liar(list): def len(self, *args, **kwargs): super().len(*args, **kwargs) return len(self) - 1

Can someone tell me what i did wrong with my code?

Thanks!

frustration.py 
class Liar(list):
    def __len__(self, *args, **kwargs):
        super().__len__(*args, **kwargs)
        return len(self) - 3

1 Answer

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

Since you're defining how the class will handle being asked for its length, then calling "len" from inside the code sets up a recursion loop. You probably want to only call the "super" length function and return a modified version of it.