需要帮助解释为什么我的二十一点游戏出现“IndexError：从空列表中弹出”错误

问题描述

我正在尝试制作二十一点游戏，当我为选择输入输入 H 或 D 时，除了 output1 和 Ctrl+C 之外，控制台不允许我的任何输入当我为选择输入输入 S 时，它会产生一个显示在 ouput2 中的错误

我的代码

from random import choice,shuffle
plain_cards = ['2','3','4','5','6','7','8','9','J','K','Q','A']
HEARTS = chr(9829)
DIAMONDS = chr(9830)
SPADES = chr(9824)
CLUBS = chr(9827)

suits = [HEARTS,DIAMONDS,SPADES,CLUBS]
def get_deck():
    deck = [(suit,card) for suit in suits for card in plain_cards]
    shuffle(deck)
    return deck

def get_cards_value(cards):
    total = 0
    aces = []
    for card in cards:
        if card[1].isdigit():
            total += int(card[1])
        if card[1] == 'K' or card[1] == 'J' or card[1] == 'Q':
            total += 10
        if card[1] == 'A' :
            total += 11
            aces.append('A')
    for i in aces:
        if total > 21:
            total -= 10

    return total


def game():
    print('Welcome to BLACK JACK')

money = 1000
playing = True
game_on = True
while playing:
    if money <= 0:
        playing = False    
        print('Thanks for playing but your money is done come back soon')
        
    else:
        bet = input('Stake: ')
        
        if  not bet.isdigit():
            print('Invalid input')
            continue
        elif int(bet) > money:
            print('You don\'t have enough money') 
            continue
        else:
            bet = int(bet)
            deck = get_deck()
            player_hand = [deck.pop(),deck.pop()]
            dealer_hand = [deck.pop(),deck.pop()]
            print('Player hand')
            print(f'{player_hand} total:{get_cards_value(player_hand)}')
            print('Dealer Hand')
            print(f'[{dealer_hand[0]},###]')
            
            player_total = get_cards_value(player_hand)
            dealer_total = get_cards_value(dealer_hand)
            while game_on:
                if player_total > 21 or dealer_total > 21:
                    break
                choice = input('(S)tand,(D)ouble,(H)it: ')
                if choice == 'D':
                    bet *= 2
                    money += bet 
                    
                if choice == 'D' or choice == 'H':
                    new_card = deck.pop()
                    player_hand.append(new_card)
                    break
                
                if choice == 'S':
                    break
                
            if player_total < 21:
                while dealer_total < 17:
                    new_card = deck.pop()
                    dealer_hand.append(new_card)
            
            if player_total == 21:
                print('You won')
                print(f'Player>>{player_hand} total:{get_cards_value(player_hand)}')
                print(f'Dealer>>{dealer_hand} total:{dealer_total}')
                money += bet
            
            elif dealer_total == 21:
                print('You lost')
                print(f'Player>>{player_hand} total:{get_cards_value(player_hand)}')
                print(f'Dealer>>{dealer_hand} total:{dealer_total}')
                money -= bet
                
            elif player_total > dealer_total:
                print('You lost')
                print(f'Player>>{player_hand} total:{get_cards_value(player_hand)}')
                print(f'Dealer>>{dealer_hand} total:{dealer_total}')
                money -= bet
                
            elif player_total < dealer_total:
                print('You win')
                print(f'Player>>{player_hand} total:{get_cards_value(player_hand)}')
                print(f'Dealer>>{dealer_hand} total:{dealer_total}')
                money += bet
            
game()

这是我输入 S、H 或 D 时的输出 回溯（最近一次调用）：

File "C:/Users/Godfrey Baguma/AppData/Local/Programs/Python/python39/ssdd.py",line 109,in <module>
    game()
  File "C:/Users/Godfrey Baguma/AppData/Local/Programs/Python/python39/ssdd.py",line 82,in game
    new_card = deck.pop()
IndexError: pop from empty list
 

解决方法

答案就在那里的错误输出中。具体来说，在这个块中：

if player_total < 21:
   while dealer_total < 17:
       new_card
       dealer_hand.append(new_card)

你没有设置 new_card 的值（你的意思是让它 new_card =deck.pop() 吗？），所以解释器不知道如何处理它并出错。

,

错误提示您要访问未知的变量。您的代码中有一个错误（第 82 行或第 83 行）。程序流可以通过调用 dealer_hand.append(new_card) 但 new_card 未知的方式发生。