Question

运行文件时，我只能打印一张证卡有问题。它仅打印“黑桃二”。我希望打印整个甲板。不使用类时，打印没有问题。但是现在我正在尝试理解课程。谁能告诉我我在做什么错？我的下面的代码.....

RANKS = {2: "Two", 3: "Three", 4: "Four", 5: "Five", 6: "Six", 7: "Seven",
         8: "Eight", 9: "Nine", 10: "Ten", 11: "Jack", 12: "Queen",
         13: "King", 14: "Ace"}

SUITS = {1: "Spades", 2: "Clubs", 3: "Diamonds", 4: "Hearts"}
################################################
class Card():
    def __init__(self, rank, suit):
        self.rank = rank
        self.suit = suit

    def __str__(self):
        return "%s of %s" %(self.rank, self.suit)

class Deck():
    def __init__(self):
        self.cards = []
        for r in RANKS.values():
            for s in SUITS.values():
                self.cards.append(Card(r, s))

    def __str__(self):
        for i in self.cards:
            return str(i)

deck = Deck()
print(deck)

Answer 1

return立即返回。您需要将所有单独的卡字符串连接成一个字符串，然后返回 that 。

例如

def __str__(self):
    return ', '.join([str(i) for i in self.cards])

Answer 2

Deck上的str函数在循环的第一次迭代中返回，因此您只能得到一张卡。

def __str__(self):
        cards = ''
        for i in self.cards:
            cards += str(i) + ' '
        return cards.strip()

应该给所有卡片一个字符串

使用python 3中的类打印卡片组

2 个答案: