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 Inheritance Super!

Rahul Dharamdasani
Rahul Dharamdasani
1,597 Points
Posted by Rahul Dharamdasani
Rahul Dharamdasani
1,597 Points

I cant seem to figure out where to add the 'self.slots.sort()' method.

I don't get why I can't simply add in the 'self.slots.sort()' line right after 'super().add_items(items)' line.

inventory.py 
class Inventory:
    def __init__(self):
        self.slots = []

    def add_item(self, item):
        self.slots.append(item)

class SortedInventory(Inventory):
    def add_item(self, item):
        self.slots.append(item)
        super().add_item(item)
        self.slots.sort()

1 Answer

Steven Parker
Steven Parker
229,744 Points
Steven Parker
Steven Parker
229,744 Points

Since your override calls the base class method, it doesn't need to "append" the item itself. That causes the item to be added twice, which then makes the final result different from what the challenge is expecting.