Question

我正在尝试编写一个处理卡片的程序，我遇到的问题是，当我将卡片对象交给一个玩家时，所有玩家都会在他们的类属性“手”中接收该对象。

代码如下，任何帮助表示赞赏！如果我没有正确遵循stackoverflow缩进格式，我很抱歉。这是我第一次发帖提问。

    import random

    class Player(object):
        def __init__(self,name,balance=100,hand=[]):
            self.name = name
            self.balance = balance
            self.hand = hand

        def reveal_all(self):
            '''
            This method prints out a player's hand.
            '''
            reveal = []
            for x in self.hand:
                reveal = reveal + [x.name]
            print(reveal)

    class Card(object):
        def __init__(self,name,val):
            self.name = name
            self.val = val

    card_ob1 = Card('2 of Hearts',2)
    card_ob2 = Card('3 of Hearts',3)
    card_ob3 = Card('4 of Hearts',4)
    card_ob4 = Card('5 of Hearts',5)
    card_ob5 = Card('6 of Hearts',6)
    card_ob6 = Card('7 of Hearts',7)
    card_ob7 = Card('8 of Hearts',8)
    card_ob8 = Card('9 of Hearts',9)

    deck = [card_ob1,card_ob2,card_ob3,card_ob4,card_ob5,card_ob6,card_ob7,card_ob8]

    def plyr1_geta_card():
        card = random.choice(deck)
        player1obj.hand += [card]
        deck.remove(card)

    def dealer_geta_card():
        card = random.choice(deck)
        dealerobj.hand.append(card)
        deck.remove(card)

    player1obj = Player('Me',100)
    dealerobj = Player('The House')

    # Player 1 gets a card
    plyr1_geta_card()

    # The card is added to both the dealer and player hand attribute for some reason!
    dealerobj.reveal_all()

    player1obj.reveal_all()

Answer 1

问题来自您的__init__ Player对象，在您的方式中，hand将在所有Player实例之间共享：如9.3.5. Class and Instance Variables {{3}部分所示}}。快速修复应该是

 def __init__(self,name,balance=100,hand=[]):
        self.hand = []
        self.name = name
        self.balance = balance
        self.hand.extend(hand)

顺便说一句，编写函数来向玩家添加卡片并不是一个好习惯，而应该是接收玩家对象的函数，如：

 def plyr_geta_card(player):
     card = random.choice(deck)
     player.hand.append(card)
     deck.remove(card)

当只指定了一个对象时，将对象添加到多个对象类属性中

1 个答案: