Angela Yu Python教程第11天Blackjack代码无法运行，请求排查

以下是你的代码中存在的关键问题及修复方案：

主要问题与修复 #

1. 函数调用错误：
   在电脑抽卡的循环中，computer_cards.append(draw_card) 没有调用函数（缺少括号），导致函数对象被添加到列表而非随机卡牌。应改为 computer_cards.append(draw_card())。

2. 未更新电脑分数：
   电脑抽卡后未重新计算分数，导致 computer_score 始终为初始值，可能引发无限循环。需在电脑每次抽卡后重新调用 calculate_score 更新分数。

3. 无意义的print调用：
   compare 函数仅打印结果但不返回值，print(compare(...)) 会额外输出 None。直接调用 compare(user_score, computer_score) 即可。

4. 输入判断逻辑错误：
   get_card == "y".lower() 写法冗余且逻辑颠倒，应先将用户输入转为小写再判断，即 get_card.lower() == "y"。

5. 跨平台清屏适配：
   替换Replit专属的clear函数为跨平台实现，让代码能在Thonny等环境运行。

修复后的完整代码 #

import random
import os

def clear():
    # 跨平台清屏函数，替代Replit专属的clear
    os.system('cls' if os.name == 'nt' else 'clear')

# 若没有art.py文件，可注释掉该行或自行定义logo变量
from art import logo

def draw_card():
    cards = [11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10, 10]
    return random.choice(cards)

def calculate_score(cards):
    if sum(cards) == 21 and len(cards) == 2:
        return 0  # 用0表示Blackjack
    if sum(cards) > 21 and 11 in cards:
        cards.remove(11)
        cards.append(1)
    return sum(cards)

def compare(user_score, computer_score):
    if user_score > 21 and computer_score > 21:
        print("You went over 21. You lost")
    elif computer_score == 0:
        print("You lost. Computer has blackjack")
    elif user_score == 0:
        print("You won with a blackjack.")
    elif user_score == computer_score:
        print("Draw")
    elif user_score > 21:
        print("You lost")
    elif computer_score > 21:
        print("You won")
    elif user_score > computer_score:
        print("You won.")
    else:
        print("Computer won")

def play_game():
    print(logo)
    user_cards = []
    computer_cards = []
    for _ in range(2):
        user_cards.append(draw_card())
        computer_cards.append(draw_card())
    
    game_end = False
    
    while not game_end:
        user_score = calculate_score(user_cards)
        computer_score = calculate_score(computer_cards)
        
        print(f"   Your cards: {user_cards}, your score: {user_score}.")
        print(f"   Computer's first card: {computer_cards[0]}")
        
        # 用户拿到Blackjack或爆牌时提前结束回合
        if user_score == 0 or user_score > 21:
            game_end = True
        else:
            get_card = input("Type 'y' to get another card, type 'n' to pass: ")
            if get_card.lower() == "y":
                user_cards.append(draw_card())
            else:
                game_end = True
    
    # 电脑按规则补牌（分数<17且未拿到Blackjack）
    while computer_score != 0 and computer_score < 17:
        computer_cards.append(draw_card())
        computer_score = calculate_score(computer_cards)
    
    print(f"   Your final hand: {user_cards}, final score: {user_score}")
    print(f"   Computer's final hand: {computer_cards}, final score: {computer_score}")
    compare(user_score, computer_score)

play = input("Do you want to play a game of blackjack. Type y or n: ").lower()
while play == "y":
    clear()
    play_game()
    play = input("Do you want to play again? Type y or n: ").lower()

额外优化说明 #

• 新增用户拿到Blackjack或爆牌时提前结束回合的逻辑，符合21点规则
• 电脑补牌逻辑移到用户回合结束后，流程更合理
• 添加游戏结束后再玩一次的询问

内容的提问来源于stack exchange，提问作者Vahaj Qureshi