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Python Object-Oriented Python Advanced Objects Frustration

Patrick Perkins
Patrick Perkins
14,619 Points
Posted by Patrick Perkins
Patrick Perkins
14,619 Points

Object-Oriented Python Frustration Challenge

I am having a bit of trouble getting this bit of code to work. The objective is to override the len() method to work on a list subclass, Liar, Any tips are appreciated

frustration.py 
class Liar(list):
    def __len__(self):
        return super().__len__(self) + 3

1 Answer

Alex Koumparos
seal-mask
.a{fill-rule:evenodd;}techdegree
Alex Koumparos
Python Development Techdegree Student 36,887 Points
Alex Koumparos
.a{fill-rule:evenodd;}techdegree
Alex Koumparos
Python Development Techdegree Student 36,887 Points

Hi Patrick,

So close! You have one small error in this line:

return super().__len__(self) + 3

When you call the __len__ method on the superclass you don't pass self: self is the argument that you define on all regular methods in a class but Python supplies self automatically when you call it.

Hope that helps,

Cheers

Alex