Python 3：根据索引替换列表中的字符

如何解决Python 3：根据索引替换列表中的字符

Python新开发者：尝试构建to子手游戏的初始部分。我无法根据确定的索引替换列表中的元素。

    word = ["kangaroo"]  # word the player needs to guess
    word_taken_out = word[0]  # convert to string
    
    hint_list = []  # initialize empty list that will be populated with question marks based on the length of the word the player needs to guess
    
    
    def populate_hint_list(hint_list):  # function to populate hint_list w/ appropriate number of question marks
        for indexes in word_splitted:
            hint_list.append("?")
        return hint_list
    
    
    def split_list(word): # function to convert the word the player will guess into a character list
        return [char for char in word_taken_out]
    
    
    word_splitted = split_list(word_taken_out) # call function and store in variable for character list
    
    hint_list = populate_hint_list(hint_list) # call function to populate the hint list with question marks
    print("The word the player will need to guess:",word[0])
    print("The Hint List:",hint_list)
    
    user_guess = input("Enter a letter: ") #prompt user to enter a letter
    
    user_guess_list = [] # initialize empty kist that will store the user's guess in a list
    user_guess_list.append(user_guess) # store the user's guess in a list
    print(user_guess_list)
    
    found_indices = [i for i,x in enumerate(word_splitted) if x == user_guess] # find index occurances where the user's guessed letter matches in the word
    print(found_indices)
    
    # insert in hint_list the user_guess based on the found indices; in other words replace the question marks in the hint_list 
    # based on the found indices that matched with the users guessed character 

解决方法

首先，为什么要创建一个包含单词的列表，然后立即删除该单词。为什么不首先分配字符串？

word = "kangaroo"

接下来，您可以创建一个列表，其中包含所有长度适当的问号，而不是功能要简单得多。

此代码将列出一个带有“？”的列表在其中，*运算符将复制并连接起来，列出所需的次数，此处为字符串的长度，即单词中的字母数。

hint_list = ["?"] * len(word)

您的列表理解功能确实可以将单词分成所需的列表，但是只需将字符串转换为列表，就可以更轻松地实现

chars = list(word)

最后，您已经正确识别了正确猜测的索引，所以现在您只需要替换“？”使用索引在hint_list中的字母

for i in found_indices:
    hint_list[i] = user_guess

这应该做您想要的。

word = "kangaroo"
print("The word the player will need to guess:",word)

hint_list = ["?"] * len(word)
print("The Hint List:",hint_list)

chars = list(word)
print("The correct characters:",chars)

user_guess_list = []  # initialize empty kist that will store the user's guess in a list

while "".join(hint_list) != word:  # loop until the game is complete
    user_guess = input("\nEnter a letter: ")  # prompt user to enter a letter

    user_guess_list.append(user_guess)  # store the user's guess in a list

    found_indices = [i for i,x in enumerate(chars) if
                     x == user_guess]  # find index occurances where the user's guessed letter matches in the word
    print("Guess found at indices:",found_indices)

    for i in found_indices:
        hint_list[i] = user_guess

    print("\nAll guesses so far:",user_guess_list)
    print("Current hint list:",hint_list)

print("\nYou did it! The word is ",word)

输出量

The word the player will need to guess: kangaroo
The Hint List: ['?','?','?']
The correct characters: ['k','a','n','g','r','o','o']

Enter a letter: a
Guess found at indices: [1,4]

All guesses so far: ['a']
Current hint list: ['?','?']

Enter a letter: b
Guess found at indices: []

All guesses so far: ['a','b']
Current hint list: ['?','?']

Enter a letter: c
Guess found at indices: []

All guesses so far: ['a','b','c']
Current hint list: ['?','?']

Enter a letter: d
Guess found at indices: []

All guesses so far: ['a','c','d']
Current hint list: ['?','?']

Enter a letter: e
Guess found at indices: []

All guesses so far: ['a','d','e']
Current hint list: ['?','?']

Enter a letter: f
Guess found at indices: []

All guesses so far: ['a','e','f']
Current hint list: ['?','?']

Enter a letter: g
Guess found at indices: [3]

All guesses so far: ['a','f','g']
Current hint list: ['?','?']

Enter a letter: h
Guess found at indices: []

All guesses so far: ['a','h']
Current hint list: ['?','?']

Enter a letter: i
Guess found at indices: []

All guesses so far: ['a','h','i']
Current hint list: ['?','?']

Enter a letter: j
Guess found at indices: []

All guesses so far: ['a','i','j']
Current hint list: ['?','?']

Enter a letter: k
Guess found at indices: [0]

All guesses so far: ['a','j','k']
Current hint list: ['k','?']

Enter a letter: n
Guess found at indices: [2]

All guesses so far: ['a','k','n']
Current hint list: ['k','?']

Enter a letter: r
Guess found at indices: [5]

All guesses so far: ['a','r']
Current hint list: ['k','?']

Enter a letter: o
Guess found at indices: [6,7]

All guesses so far: ['a','o']
Current hint list: ['k','o']

You did it! The word is  kangaroo