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Вот код, который у меня есть:

 if letter_user not in letters_word:
      mistakes  = 1
      wrong_letters.append(letter_user)
if letter_user not in alphabet:
      print('Please only enter ONE letter.')
 

Я создал список алфавита, и если пользователи угадают, что его нет в этом списке, то они получат предупреждение «Пожалуйста, введите только ОДНУ букву». Однако счетчик «ошибок» все равно увеличивается, что приводит к тому, что пользователь теряет жизнь, чего я не хочу.

Как мне сделать так, чтобы пользователь не потерял жизнь при вводе недопустимого персонажа в этой игре «палач»?

Вот мой полный код:

 # importing wordbank
import random
from wordbankcool import wordbank

# hangman graphics
hangman_graphics = ['_',
                    '__',
                    '__n |',
                    '__n |n O',
                    '__n |n On |',
                    '__n |n On/|',
                    '__n |n On/| ',
                    '__n |n On/| n/',
                    '__n |n On/| n/  '
                    ]

# code is inside while loop
playagain = 'Y'
while playagain == 'Y':

    # alphabet
    alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
                'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

    # basic functions of the game
    mistakes = 0
    letters_guessed = []
    mistakes_allowed = len(hangman_graphics)

    # selecting a random word for the user to guess
    word = random.choice(wordbank)

    # letters user has guessed   guessed incorrectly stored in lists
    letters_word = list(word)
    wrong_letters = []

    print()

    # amount of letters the word has
    print('The word has {} letters'.format(len(letters_word)))

    # while loop which will run until the the number of mistakes = number of mistakes allowed
    while mistakes < mistakes_allowed:
        print()
        print('Incorrect guesses: ', end='')
        for letter in wrong_letters:
            print('{}, '.format(letter), end='')
        print()
        print('Guesses left: {}'.format(mistakes_allowed - mistakes))
        letter_user = input('Guess a letter: ').lower()

    # checking if the letter has been guessed before
        while letter_user in letters_guessed or letter_user in wrong_letters:
            print()
            print('You have already guessed this letter, guess a different one.')
            letter_user = input('Guess a letter: ')

    # increasing amount of mistakes if the letter that has been guessed is not in the word
        if letter_user not in letters_word:
            mistakes  = 1
            wrong_letters.append(letter_user)
        if letter_user not in alphabet:
            print('Please only enter ONE letter.')

        print()

    # showing how many letters the user has/has not guessed
        print('Word: ', end='')

    # if letter is in word, its added to letters guessed
        for letter in letters_word:
            if letter_user == letter:
                letters_guessed.append(letter_user)

    # replace letters that haven't been guessed with an underscore
        for letter in letters_word:
            if letter in letters_guessed:
                print(letter   ' ', end='')
            else:
                print('_ ', end='')

        print()

    # hangman graphics correlate with amount of mistakes made
        if mistakes:
            print(hangman_graphics[mistakes - 1])
        print()
        print('-------------------------------------------')  # seperator

    # ending: user wins
        if len(letters_guessed) == len(letters_word):
            print()
            print(f'You won! The word was {word}!')
            print()
            playagain = input('Play again? (Y/N) ').upper()
            if playagain == 'Y':
                word = random.choice(wordbank)
                break
            elif playagain == 'N':
                break

    # ending: user loses
    if mistakes == mistakes_allowed:
        print()
        print('Unlucky, better luck next time!')
        print()
        print(f'The word was {word}.')
        print()
        playagain = input('Play again? (Y/N) ').upper()
        if playagain == 'Y':
            word = random.choice(wordbank)
 

Вы могли бы переместить проверку на неправильный ввод вверх, чтобы это произошло раньше. Затем вы можете использовать continue оператор — это в основном переход к концу цикла, пропуская все после него.

 if letter_user not in alphabet:
    print('Please only enter ONE letter.')
    continue
if letter_user not in letters_word:
    mistakes  = 1
    wrong_letters.append(letter_user)
....
 

Однако у вас уже есть входной цикл, так что вы можете проверить его там.

 while True:
    letter_user = input('Guess a letter: ').lower()
    if letter_user not in alphabet:
        print('Please only enter ONE letter.')
    elif letter_user in letters_guessed or letter_user in wrong_letters:
        print('You have already guessed this letter, guess a different one.')
    else:
        break