__str__() help python 3

Question

I append all possible cards in self.deck list but when I tried to print out the list with string representation method it gave me <__main__.Deck object at 0x00238148> I don't know why! My code is below and I would really appreciate if anyone could look at it and just tell me how to get all card in class Deck?

suits = ('Hearts', 'Diamonds', 'Spades', 'Clubs')
ranks = ('Two', 'Three', 'Four', 'Five', 'Six', 'Seven', 'Eight', 'Nine', 'Ten', 'Jack', 'Queen', 'King', 'Ace')

class Card():

    def __init__(self, suit, rank):
        self.suit = suit
        self.rank = 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

deck = Deck()
print(deck)

Answer 1

The __str__ method should always return string. Here in your card class the return type of __str__ is correct but in the Deck class you are returning the card object rather you should call the string representation of the card object inside __str__ method.

   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 str(card)