Python Object-Oriented Python Inheritance Super!

Mathew Yangang
Mathew Yangang
Python Web Development Techdegree Student 4,433 Points

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
28,135 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

Mark Chesney
Mark Chesney
11,513 Points

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)

Mark Chesney
Mark Chesney
11,513 Points

no idea myself but i really would like to know!

Donatas Ramanauskas
Donatas Ramanauskas
28,135 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)

Mathew Yangang
Mathew Yangang
Python Web Development Techdegree Student 4,433 Points

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

Mathew Yangang
Mathew Yangang
Python Web Development Techdegree Student 4,433 Points

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)