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python - 当我想要一个列表时，为什么我得到一个元组作为返回值？

问题描述

对于我的第一个项目，我正在尝试制作二十一点。我希望能够在列表中返回user_cardsandcomputer_cards然后在下一个函数中使用它们来检查二十一点（21）。出于某种原因，我得到这个错误代码，因为它把这些值作为一个元组返回，我想？

Traceback (most recent call last):
  File "main.py", line 1, in <module>
    from black_jack_game import *
  File "/home/runner/blackjack-start/black_jack_game.py", line 52, in <module>
    calculate_score(dealt_cards)
  File "/home/runner/blackjack-start/black_jack_game.py", line 43, in calculate_score
    if user_card[item] == 11:
TypeError: list indices must be integers or slices, not tuple

代码 ：

import random

# dealing the cards to the user
def deal_card():
    cards = [11,2,3,4,5,6,7,8,9,10,10,10,10] * 4 #  a full 52 card deck
    user_cards = []
    computer_cards = []

    #getting a random card 
    for i in range(0,3):
        user_cards.append(random.choice(cards))
        computer_cards.append(random.choice(cards))
    
    # this will remove the cards that have ben used
    for i in user_cards:
        if i in cards:
            cards.remove(i)

    for i in computer_cards:
        if i in cards:
            cards.remove(i)

    # this returns a list
    return [user_cards,computer_cards]

dealt_cards = deal_card()


# adding the score up of those cards 
def calculate_score(func):

    #spliting the list that returned from the last function
    user_card = dealt_cards[0]
    computer_card = dealt_cards[1]
    
    #getting the sum
    user_card_sum = sum(user_card)
    computer_card_sum = sum(computer_card)

    # check for an 11 (ace)
    # over 21, remove the 11 and replace it with a 1
    for item in enumerate(user_card):
        if user_card[item] == 11:
            user_card[item] = 1
    
    # a hand with only 2 cards: ace + 10) and return 0 
    if user_card_sum == 21 | computer_card_sum == 21:
        return 0

    print(user_card,user_card_sum)

calculate_score(dealt_cards)

标签： pythonlisttuples

解决方案

您在循环中使用enumerate()了方法 for

enumerate()方法将计数器添加到可迭代对象并返回它。返回的对象是一个枚举对象。基本上它(index, element)为数组中的每个元素返回对。

因此，您可以尝试通过将代码更改为：

for index, item in enumerate(user_card):
        if user_card[index] == 11:
            user_card[index] = 1

或者简单地说：

for idx in range(len(user_card)):
    if user_card[idx] == 11:
        user_card[idx] = 1

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