如何在 Python 中停止这个循环？

Question

这完全按照我的意愿工作，除了当用户输入无效选项时我无法让它停止。这是一个石头剪刀布游戏，它不仅记录用户的输入，而且保留当前回合的得分，并保留所有回合的最终得分，直到游戏结束......就像现在一样，永远不会发生。当用户输入无效选项时，我该如何结束这个游戏？我尝试使用break，但它无效。

def rock_paper_scissors():
    playerScore = 0
    computerScore = 0

    print("")

    player = input("Choose Rock, Paper, or Scissors: ")
    player = player.lower()

    choices = ["rock", "paper", "scissors"]

    computer = random.choice(choices)


    if player == computer:
        print("I chose " + str(computer) + " and you chose " + player + ". It's a tie!")
    elif player == "rock" and computer == "scissors":
        playerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". Congratulations! You won! " + player + " beats " + str(computer) + ".")
    elif player == "paper" and computer == "rock":
        playerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". Congratulations! You won! " + player + " beats " + str(computer) + ".")
    elif player == "scissors" and computer == "paper":
        playerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". Congratulations! You won! " + player + " beats " + str(computer) + ".")
    elif computer == "rock" and player == "scissors":
        computerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". You lost! " + str(computer) + " beats " + player + ".")
    elif computer == "paper" and player == "rock":
        computerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". You lost! " + str(computer) + " beats " + player + ".")
    elif computer == "scissors" and player == "paper":
        computerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". You lost! " + str(computer) + " beats " + player + ".")
    else:
        print("Sorry, but you entered an invalid option.  The game has ended.  See below for the final score.  Thank you for playing")
        print("")
        print("Your score:", str(playerScore) + ", Computer score:", str(computerScore))

    return playerScore, computerScore

playerFinal = 0
computerFinal = 0

while True:
    player, computer = rock_paper_scissors()
    playerFinal += player
    computerFinal += computer
    print("Your score:", str(playerFinal) + ", Computer score:", computerFinal)

Answer 1

这可以通过简单地添加一个标志来检查是否需要结束while True循环来解决。 这里：

import random
def rock_paper_scissors():
    playerScore = 0
    computerScore = 0
    flag = False

    print("")

    player = input("Choose Rock, Paper, or Scissors: ")
    player = player.lower()

    choices = ["rock", "paper", "scissors"]

    computer = random.choice(choices)


    if player == computer:
        print("I chose " + str(computer) + " and you chose " + player + ". It's a tie!")
    elif player == "rock" and computer == "scissors":
        playerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". Congratulations! You won! " + player + " beats " + str(computer) + ".")
    elif player == "paper" and computer == "rock":
        playerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". Congratulations! You won! " + player + " beats " + str(computer) + ".")
    elif player == "scissors" and computer == "paper":
        playerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". Congratulations! You won! " + player + " beats " + str(computer) + ".")
    elif computer == "rock" and player == "scissors":
        computerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". You lost! " + str(computer) + " beats " + player + ".")
    elif computer == "paper" and player == "rock":
        computerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". You lost! " + str(computer) + " beats " + player + ".")
    elif computer == "scissors" and player == "paper":
        computerScore += 1
        print("I chose " + str(computer) + " and you chose " + player + ". You lost! " + str(computer) + " beats " + player + ".")
    else:
        flag = True
        print("Sorry, but you entered an invalid option.  The game has ended.  See below for the final score.  Thank you for playing")
        print("")
        print("Your score:", str(playerScore) + ", Computer score:", str(computerScore))

    return playerScore, computerScore, flag

playerFinal = 0
computerFinal = 0

while True:
    player, computer, flag = rock_paper_scissors()
    playerFinal += player
    computerFinal += computer
    print("Your score:", str(playerFinal) + ", Computer score:", computerFinal)
    if flag:
        break

Answer 2

如果返回的分数都为零，则玩家输入错误，您可以中断循环。

while True:
    player, computer = rock_paper_scissors()
    if player == 0 and computer == 0:
        break
    playerFinal += player
    computerFinal += computer
    print("Your score:", str(playerFinal) + ", Computer score:", computerFinal)

Answer 3

在无效的选择后面加上break 你可以让玩家在那个时候用减号滚动

if player < 0
   playerFinal = -1 * player
   break

Answer 4

从以下位置更改循环条件：

while True:

到：

while True and (player+computer) != 0 :

如果用户选择无效，则该轮的得分将为 0，并且下次循环不会通过条件。