我无法在二十一点游戏中关闭我的while循环[关闭]答案

【问题标题】：I cant close my while-loop in a Blackjack game [closed]我无法在二十一点游戏中关闭我的while循环[关闭]
【发布时间】：2021-12-02 19:32:25
【问题描述】：

我正在用 Python 制作二十一点游戏，并且正在使用 while 循环。在我的代码中，我得到了一个带有 if 语句的输入，如果玩家选择再玩一轮（输入“Y”），游戏就会重新开始（我没有问题）。我的问题是，如果玩家输入“N”（表示否），游戏仍然会重新运行。我想做的是当玩家输入“N”时，游戏结束。我的代码有什么问题？我被卡住了，无法弄清楚。

您也可以在我的代码中看到，我在 while 循环中多次使用 closed = True 并且它有效（例如，如果玩家获得 21 分，则游戏结束）。唯一一次 closed = True 不起作用是在我的代码的elif play_again.lower() != "Y": closed = True 部分。

closed = False
while not closed:

    if player_total == 21:
        print("\nCongrats, the player got a Blackjack!")
        closed = True

    else:
        input_answer = int(input("\n1 - Hit \n2 - Stand \n \nDo you wish to Hit or Stand? "))

        if input_answer == 1:
            print("You chose to Hit.")
            give_cards(player_hand, 1)
            player_total = bjm.calculate_hand_value(player_hand)
            print(f'\nThe player has got a new card: {player_hand[2]}. \nThe player currently has {", ".join(player_hand)},'
                  f' with a total value of {player_total}.')

            if player_total > 21:
                print("Busted! You got a total value over 21.")
                closed = True

        elif input_answer == 2:
            print("\nYou chose to Stand.")
            print(f'The dealers cards are: {" and a ".join(dealer_hand)}, with a total value of {dealer_total}.')
            print(f'The players cards are {", ".join(player_hand)} with a total value of {player_total}.')
            print_result(player_hand, dealer_hand)

            play_again = input("\nDo you want to play another round? Y/N: ")

            if play_again.lower() != "N":
                print("You wanted to play another round, you will be dealt two new cards.\n")

                player_hand.clear()
                dealer_hand.clear()

                give_cards(player_hand, 2)
                give_cards(dealer_hand, 2)

                print(f'\nThe players new cards are: {" and a ".join(player_hand)}, with a total value of {player_total}.')
                print(f'The dealers new cards are: {" and a ".join(dealer_hand)}, with a total value of {dealer_total}.')

            elif play_again.lower() != "Y":
                closed = True

closed = True

【问题讨论】：

.lower() 的东西永远不会等于大写 Y

标签： python while-loop blackjack

【解决方案1】：

比您现在使用的结束循环更好的方法是简单地将closed = True 中的条件替换为break。

此外，您的代码无法正常工作的原因是您试图将 .lower()（它总是给您一个小写字母）与一个大写字母进行比较，这意味着这种情况：

            elif play_again.lower() != "Y":
                closed = True

永远不会是真的。

用"y"代替"Y"

【讨论】：

非常感谢！！我想我因为阅读代码太多而失明，所以我没有注意到，但你的回答有效:)
干杯兄弟！如果您还有任何问题，请不要犹豫：)。

【解决方案2】：

我不确定您为什么要使用双重否定。试试这个：

while True:
    ...
    elif play_again.lower() != "Y":
        break #instead of closed=True

【讨论】：

【解决方案3】：

删除 .lower()。您正在尝试小写并使用 Y 或 N 验证它，这永远不会到达 else 语句

例子-


play_again = input("\nDo you want to play another round? Y/N: ")

if play_again != "N":
    print("You wanted to play another round, you will be dealt two new cards.\n")

elif play_again != "Y":
    print("Dont want to play")

【讨论】：

【解决方案4】：

您可以将可接受的答案设置为

valid_answers = ['yes', 'no']
if valid_answers == "no":
   print("You wanted to play another round, you will be dealt two new cards.\n")
   player_hand.clear()
   dealer_hand.clear()
   give_cards(player_hand, 2)
   give_cards(dealer_hand, 2)
   print(f'\nThe players new cards are: {" and a ".join(player_hand)}, with a total value of {player_total}.')
            print(f'The dealers new cards are: {" and a ".join(dealer_hand)}, with a total value of {dealer_total}.')

else: 
   closed = True

【讨论】：