python - 内置名称错误 : name 'guess' is not defined

Question

我正在做一项实验室作业，几天来我一直在与一个错误作斗争。我也在我的函数中编码了 return ，它一直说有一个 NameError: 但我没有定义它。

这是我正在编写的代码，由于我还没有完成，所以一切都搞砸了。但我很想知道我搞砸了什么以及如何修复名称错误。谢谢!

import random

def main():
    instructions = display_instructions("instructions.txt")


    #display instructions
    display_instructions(instructions)


    list_of_words = ['apple', 'banana', 'watermelon', 'kiwi', 'pineapple', 
                 'mango']

    correct_word=random.choice(list_of_words)
    answer = list(correct_word)

    puzzle = []
    puzzle.extend(answer)

    display_puzzle_string(puzzle)

    play_game(puzzle, answer)

    display_result(is_win, answer)


    input('Press enter to end the game.')

def display_instructions(filename):
    instruction_file=open("instructions.txt","r")
    file_contents=instruction_file.read()
    instruction_file.close()
    print(file_contents)


def display_puzzle_string(puzzle):
    for i in range(len(puzzle)):
        puzzle[i] = '_'
    print('The answer so far is '+" ".join(puzzle))


def play_game(puzzle, answer):
    num_guesses = 4    
    while num_guesses > 0:
        get_guess(num_guesses)
        update_puzzle_string(puzzle, answer, guess)
        display_puzzle_string(puzzle)
    is_word_found(puzzle)


def get_guess(num_guesses):
    guess=input('Guess a letter '+'('+str(num_guesses)+' guesses remaining):')
    return guess


def update_puzzle_string(puzzle, answer, guess):
    for i in range(len(answer)):
                if guess.lower() == answer[i]:
                    puzzle[i] = guess.lower()
                    num_guesses += 1    
    return puzzle


 def is_word_found(puzzle):
    if puzzle == answer:
        return is_win


def display_result(is_win, answer):
    if is_win:
        print('Good job! You found the word '+correct_word+'!')

    else: 
        print('Not quite, the correct word was '+correct_word+
          '. Better luck next time')

main()

Answer 1

在函数 play_game 中，您有行 get_guess(num_guesses) 返回变量猜测。但是，您没有将猜测值分配给函数中的变量。您可以通过将该行更改为 guess = get_guess(num_guesses) 来解决此问题。该错误准确地告诉您出了什么问题。到目前为止，您还没有定义变量 guess。