Question

我正在尝试创建一个简单的Rock，Paper，Scissors游戏，但我总是得到标题中指定的错误。这是代码。第21行弹出错误。我是初学者，所以请保持相对简单。

import random

def displayIntro():
print('Hello! This a game of Rock, Paper, Scissors, against the computer.')
print()

def humanChoice():
playerChoice = ''
while playerChoice != 'Rock' and playerChoice != 'Paper' and playerChoice != 'Scissors':
    print('Please choose: Rock, Paper or Scissors. BTW: Please type your choice with the first letter as a capital.')
    playerChoice = input()

return playerChoice

a = ["Rock", "Paper", "Scissors"]

def computerChoice():
    compChoice = random.choice(a)

def winner():
    if playerChoice == compChoice:
        print('You tied! The computer also chose ' + playerChoice)

    elif playerChoice == Rock and compChoice == Scissors:
    print('You won! You chose ' + playerChoice + ' and the computer chose ' +compChoice)

    elif playerChoice == Paper and compChoice == Rock:
    print('You won! You chose ' + playerChoice + ' and the computer chose ' +compChoice)

    elif playerChoice == Scissors and compChoice == Paper:
    print('You won! You chose ' + playerChoice + ' and the computer chose ' +compChoice)

    else:
    print('You lost! You chose ' + playerChoice + ' and the computer chose ' +compChoice)

playAgain = 'yes'

while playAgain == 'yes' or playAgain == 'Yes':

    displayIntro()

    humanChoice()

    computerChoice()

    winner()

    print('Do you want to play again? (yes or no)')
    playAgain = input()

Answer 1

您在代码中遇到了几个问题：

缩进
未定义playerChoice，compChoice，Rock，Paper，Scissors变量
代码“闻起来”不好，它不知道PEP8样式指南（对不起，听起来有点粗鲁，我不知道你正在学习python）

return

computerChoice()

但主要问题是未定义的变量。您应该将humanChoice()和computerChoice()函数的结果传递给winner()函数，而不是使用全局变量。此外，您应该制作Rock，Paper，Scissors字符串。

以下是修改后的代码：

import random


def displayIntro():
    print('Hello! This a game of Rock, Paper, Scissors, against the computer.')
    print()


def humanChoice():
    playerChoice = ''
    while playerChoice != 'Rock' and playerChoice != 'Paper' and playerChoice != 'Scissors':
        print('Please choose: Rock, Paper or Scissors. BTW: Please type your choice with the first letter as a capital.')
        playerChoice = input()

    return playerChoice


def computerChoice():
    return random.choice(["Rock", "Paper", "Scissors"])


def winner(playerChoice, compChoice):
    if playerChoice == compChoice:
        print('You tied! The computer also chose ' + playerChoice)

    elif playerChoice == 'Rock' and compChoice == 'Scissors':
        print('You won! You chose ' + playerChoice + ' and the computer chose ' + compChoice)

    elif playerChoice == 'Paper' and compChoice == 'Rock':
        print('You won! You chose ' + playerChoice + ' and the computer chose ' + compChoice)

    elif playerChoice == 'Scissors' and compChoice == 'Paper':
        print('You won! You chose ' + playerChoice + ' and the computer chose ' + compChoice)

    else:
        print('You lost! You chose ' + playerChoice + ' and the computer chose ' + compChoice)


playAgain = 'yes'
while playAgain in ('yes', 'Yes'):
    displayIntro()
    playerChoice = humanChoice()
    compChoice = computerChoice()
    winner(playerChoice, compChoice)

    print('Do you want to play again? (yes or no)')
    playAgain = input()

Answer 2

如果你想修改playerChoice，你需要在函数中将它声明为全局，并将它声明在你想要使用它的第一个位置上方：

playerChoice = ''

def humanChoice():
    global playerChoice
    playerChoice = '...'

请注意，这不是一个很好的编程策略，因为它使用全局变量（http://en.wikipedia.org/wiki/Global_variable）。

Answer 3

您可以在函数之外声明它：

playerChoice = ''
def humanChoice():

希望有所帮助

Python错误：NameError：未定义全局名称“playerChoice”

3 个答案: