Python classes inheritance issue

Question

I have the following classes for a game of black jack.

class Player:
    
    def __init__(self, player, balance=0): 
        self.player = player
        self.balance = balance
        
    def __str__(self):
        return f'Player:   {self.player}\n Balance:  ${self.balance}'
        
    def bet(self):
        print(self.balance)


class Dealer(Player):
    
    def __init__(self):    
        pass

I am trying to call the bet method from Player class through the Dealer class but am getting the following error when I print(self.balance).

AttributeError: 'Dealer' object has no attribute 'balance'

I changed this to print(Player.balance) but this does not work either. Can someone please point me in the right direction?

name = input("Enter your full name:        ")   
balance =int(input("Enter the amount you would like to place on the table?  "))
    
my_player = Player(name, balance)    


my_dealer = Dealer() 
my_dealer.bet()

`__init__` of `Dealer` overridden the `__init__` of `Player` class — Moinuddin Quadri, Jan 14 '21 at 13:09
Because `Dealer`'s `__init__()` doesn't initialise `self.balance`, that attribute doesn't exist. You need to either not provide a `__init__()` method on `Dealer` (so `Player`'s __init__ is used, i.e. you have to provide player and option balance), or `Dealer`'s __init__() needs to have parameters which call super().__init__() with those params. — DisappointedByUnaccountableMod, Jan 14 '21 at 13:10
Does this answer your question? [What does 'super' do in Python?](https://stackoverflow.com/questions/222877/what-does-super-do-in-python) — costaparas, Jan 14 '21 at 13:10
If your dealer doesn't have a balance, consider having it not be a subclass of player. — khelwood, Jan 14 '21 at 13:12
@unaied Try to always provide errors in the question itself by [editing](https://stackoverflow.com/posts/65719539/edit) it. — Ted Klein Bergman, Jan 14 '21 at 13:12

score 3 · Answer 1 · answered Jan 14 '21 at 13:12

3

Python doesn't automatically call __init__ for super classes. You need to call super in your Dealer class

class Dealer(Player):
    def __init__(self):
        super().__init__(..., ...)
...

In your case, you're not using the Dealer's __init__ so you can remove it completely, in which case it'll inherit its super implementation anyway.

answered Jan 14 '21 at 13:12

Holloway

6,412
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I did this which seems to have fixed one part of the issue but when the value of balance is updated and I print the self.balance again it returns the original value and not the updated one – unaied Jan 14 '21 at 13:26
can I make the self. balance a global attribute – unaied Jan 14 '21 at 13:26
balance is an attribute of `self`. How are you updating it? – Holloway Jan 14 '21 at 13:31
self.balance -= bet_amt – unaied Jan 14 '21 at 13:33
Without seeing the full code I couldn't say why it was not appearing to be updated. – Holloway Jan 14 '21 at 13:34
can I add the full code here or I could add to a github? – unaied Jan 14 '21 at 13:35
I have saved the rough working file here https://github.com/unaied/BlackJack/blob/main/working_file – unaied Jan 14 '21 at 13:40
You are recreating the `Dealer` instance on each loop. It is also using the global `player` and `balance` values used to create the player. You 're probably better off removing the `Dealer`'s `__init__`. – Holloway Jan 14 '21 at 13:53

score 1 · Answer 2 · edited Jan 14 '21 at 13:14

1

Nice works bro! You just miss a little thing when you inherit a class. At __init__ method, you need to pass a statement: super().__init__(...). In (...), you have to pass all the attributes of the parent class have. After that, you can call the attributes and methods of the parent class.

edited Jan 14 '21 at 13:14

Ted Klein Bergman

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answered Jan 14 '21 at 13:13

Halley

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Python classes inheritance issue

2 Answers2