Question

我正在使用python创建一个黑杰克游戏。我已经做了很多关于局部变量，传递，返回的阅读，但是我很困惑为什么main（）函数中的print语句以下面的方式工作，但是当我将它更改为

时

print "The playerCards are: ", returned_playerCards

它打印＆＃39;无＆＃39;如果我有'击中'＃39;我的其他功能中的另一张卡。 playerCards列表是全局的吗？当我调用我的playerDecision函数然后调用playerHit函数然后调用playerDecision函数时发生了什么。只要输入所有内容，我就会认为这是错误的做法。我怎么办呢？

from random import randint
import time
A = 11
J = 10
Q = 10
K = 10
cards = [A,2,3,4,5,6,7,8,9,10,J,Q,K]

def deal():     
    #playerCards = [cards[randint(0,len(cards)-1)],cards[randint(0,len(cards)-1)]]
    playerCards = [2,3]
    dealerCards = [cards[randint(0,len(cards)-1)],cards[randint(0,len(cards)-1)]]
    print "You have been dealt a ", playerCards[0], "and a ", playerCards[1]
    time.sleep(1.5)
    print "Dealer is showing ", dealerCards[0]
    time.sleep(1)
    return(playerCards, dealerCards)


def playerDecision(playerCards):
    stayhit = raw_input("Would you like to 'stay' or 'hit' >> ")
    if stayhit == 'hit':
        playerCards = playerHit(playerCards)
    elif stayhit == 'stay':
        print "playerCards in elif of playerDecision ", playerCards
        return(playerCards)
    return(playerCards)

def playerHit(playerCards):
    playerCards.insert(0, cards[randint(0,len(cards)-1)])
    print "You were dealt a  ", playerCards[0]
    time.sleep(1.5)
    print "Your current total is ", sum(playerCards)
    time.sleep(1.5)
    if sum(playerCards) > 21:
        return(playerCards)
    else:
        print "PlayerCards in else of playerHit are ", playerCards
        playerDecision(playerCards)

def main():
    playerCards, dealerCards = deal()
    returned_playerCards = playerDecision(playerCards)      
    print "The player cards are:  ", playerCards

if __name__ == "__main__":
    main()

Answer 1

猜测，你在哪里

    else:
        print "PlayerCards in else of playerHit are ", playerCards
        playerDecision(playerCards)

您需要return：

    else:
        print "PlayerCards in else of playerHit are ", playerCards
        return playerDecision(playerCards)

否则函数结束时没有return语句，相当于return None。

Python列表传递

1 个答案: