CODEWITHSUNDEEP
pythonlistclassmethodsprinting
SolnLase
SolnLase

Reputation: 89

How to print a list from a class

I've tried diffrent methods to print a list from a class by looping it or changing it for a string. When I change it within a class for a string I get multiple "<__main__.Card object at 0x00000262D8279820>" and when I'm looping it within a class I get Traceback "TypeError: __str__ returned non-string (type Card)". How can I simply display a list from a class?


class Card:
    def __init__(self, suit, rank):
        self.suit = suit
        self.rank = rank
        self.value = values[rank]

    def __str__(self):
        return self.rank + ' of ' + self.suit

class Deck:
    def __init__(self):
        self.deck = []
        for suit in suits:
            for rank in ranks:
                self.deck.append(Card(suit, rank))

    def __str__(self):
        for card in self.deck:
            return card

Upvotes: 1

Views: 863

Answers (3)

quamrana
quamrana

Reputation: 39354

I don't know what a Card is, but you can just return the string of the deck:

class Deck:
    def __init__(self):
        self.deck = []
        for suit in suits:
            for rank in ranks:
                self.deck.append(Card(suit, rank))

    def __str__(self):
        return str(self.deck)

You may need to also implement __repr__() to get lists to render your cards:

class Card:
    def __init__(self, suit, rank):
        self.suit = suit
        self.rank = rank
        self.value = values[rank]

    def __str__(self):
        return self.rank + ' of ' + self.suit
    def __repr__(self):
        return self.__str__()

Upvotes: 0

Saatvik Ramani
Saatvik Ramani

Reputation: 477

From what I gather you are trying to print the contents of a list. But it looks like the list contains cards of the class Card. It is also an object and will return something like "<main.Card object at 0x00000262D8279820>". It seems like you will need __str__ for the Card class too.

Also using return will only return the first element as it will exit the block.

Upvotes: 0

qcoumes
qcoumes

Reputation: 517

You actually never transformed your card to a string in your given example. Here's a way to do it.

class Deck:
    def __init__(self):
        self.deck = []
        for suit in suits:
            for rank in ranks:
                self.deck.append(Card(suit, rank))

    def __str__(self):
        return ', '.join(map(str, self.deck))
  • map(str, self.deck) will transform every element of self.deck to a string using their __str__ method.
  • ', '.join(...) will concatenate every element of the list, separating they with ', '.

This will work assuming your Card class defines a __str__ method, for instance :

class Card:

   [...]

    def __str__(self):
        return f"{self.suite}: {self.rank}"

Upvotes: 1

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