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
– Moinuddin Quadri, Commented Jan 14, 2021 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
– DisappointedByUnaccountableMod, Commented Jan 14, 2021 at 13:10
Does this answer your question? What does 'super' do in Python? — costaparas
– costaparas, Commented Jan 14, 2021 at 13:10
If your dealer doesn't have a balance, consider having it not be a subclass of player. — khelwood
– khelwood, Commented Jan 14, 2021 at 13:12

Holloway · Accepted Answer · 2021-01-14 13:12:08Z

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, 2021 at 13:12

Holloway

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8 Comments

unaied Over a year ago

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 Over a year ago

can I make the self. balance a global attribute

Holloway Over a year ago

balance is an attribute of self. How are you updating it?

unaied Over a year ago

self.balance -= bet_amt

Holloway Over a year ago

Without seeing the full code I couldn't say why it was not appearing to be updated.

|

Ted Klein Bergman · Accepted Answer · 2021-01-14 13:14:11Z

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, 2021 at 13:14

Ted Klein Bergman

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answered Jan 14, 2021 at 13:13

Halley

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