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!

The super function

How do I override a method using the super() function? The video is kind of confusing

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

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

class SortedInventory(Inventory):
    def __init__(self,item):
        super().__init__(self,item)

4 Answers

Donatas Ramanauskas
Donatas Ramanauskas
28,538 Points

This should pass step2:

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

For step 3:

class SortedInventory(Inventory): def add_item(self, item): super().add_item(item) # calls parent method and adds item self.slots.sort() # sorts items

The task does not ask to override init

Oh wow, that's very puzzling -- I have to remove self from the last line?? I thought I pass self in as a parameter. My mistake! Very difficult stuff!

class SortedInventory(Inventory):
    def add_item(self, item): 
        super().add_item(item) 
Brad Givens
Brad Givens
6,621 Points

For step 2: removed the 'self' from super().add_item(item) and it worked. Code that passed below, not 100% sure why the self is not needed when overriding using super().

Any ideas?

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)

no idea myself but i really would like to know!

Donatas Ramanauskas
Donatas Ramanauskas
28,538 Points

You need to override add_item method

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)

Is there not suppose to be an init function super? because the above code is not passing for some reasons

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(self,item)