Python循环无法正常工作

Question

I am trying to create a game where user enters letters until they guess the secret word, but for some reason my lists are not updating properly. Lets say the secret word is TOYS, if the user guesses T it displays T _ _ _ and then the user enters S but the word still displays T_ _ _ , adds S to the list of lettersInWord, and tells the user that S is NOT in the word. The loops are run in a while loop but the problem occurs inside the loop.

letter = input("Enter letter: ")
if letter not in enteredLetters:
    find = sentence.find(letter)
    if find == -1:
        print("Letter is not in word")
    else:
        newSentence = ""
        lettersInWord.append(letter)
        for letter in sentence:
            if letter in lettersInWord:
                newSentence = newSentence + letter 
            else:
                newSentence = newSentence + "_ "        
elif letter in enteredLetters:
    print ("The letter has been used")
print (newSentence)
enteredLetters.append(letter)

Answer 1

You are rebinding letter in your loop:

for letter in sentence:
    if letter in lettersInWord:

letter is now a character in sentence , not the original user input. After that loop it'll still be bound to the last character in sentence , so 'S' .

At the end of your code, it is this character (the last one in your sentence) that is added to enteredLetters :

enteredLetters.append(letter)

so enteredLetters now contains ['S'] , not ['T'] .

You'll need to pick a different name for the loop variable; char is a commonly used name:

for char in sentence:
    if char in lettersInWord:
        newSentence = newSentence + char 
    else:
        newSentence = newSentence + "_ "