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!

Daniel D'luyz
Daniel D'luyz
2,880 Points
Posted by Daniel D'luyz
Daniel D'luyz
2,880 Points

The list isn't sorted

Hi !

I am working on this assignment and there seems to be a problem because the slots of the SortedInventory don't get updated when I call the sort function.

Any help is appreciated !

Thanks !

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):
        super().add_item(item)
        self.slots = self.slots.sort()
Daniel D'luyz
Daniel D'luyz
2,880 Points
Daniel D'luyz
Daniel D'luyz
2,880 Points

My mistake

There was no need for 

          self.slots =

The correct answer was :

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

2 Answers

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

Congratulations on resolving your own issue! :+1:

And for future reference, another solution (but not quite as good) would have been:

        self.slots = self.slots.sorted()
neville marikano
neville marikano
2,602 Points
neville marikano
neville marikano
2,602 Points

Great! Now override the add_item method. Use super() in it to make sure the item still gets added to the list.

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

Huh? That was already done in the previous step.