Question

我正在制作一个石头剪刀游戏。一切正常，除了我无法理解为什么第二个while循环不能在这段代码中工作。我想制作程序，以便用户不输入＆＃34; R＆＃34;或＆＃34; P＆＃34;或＆＃34; S＆＃34;然后用户将被告知这是一个无效的条目，它将提示用户再次输入他们的答案。它对于player1完全正常，但它不适用于player2。对于player2，如果你没有输入＆＃34; R＆＃34;或者＆＃34; P或＆＃34; S＆＃34;，然后它会提示您再次输入一个新值，但只会输入一次，无论您输入什么。所有帮助都赞赏！

if playGame == "Y":
    print("Ok, here we go.")

    player1 = input("Player1, what is your choice, R, P, or S? ")
    player1 = player1.upper()

    while player1 != 'R' and player1 != 'P' and player1 != 'S':
            player1 = input("Invalid answer.  Please answer R, P, or S: ")
            player1 = player1.upper()

    player2 = input("Player2, what is your choice, R, P, or S? ")
    player2 = player2.upper()

    while player2 != 'R' and player2 != 'P' and player2 != 'S':
            player2 = input("Invalid answer.  Please answer R, P, or S: ")
            player2 = player1.upper()

Answer 1

错误在最后一行

player2 = player1.upper()

应该是

player2 = player2.upper()

Answer 2

当用户输入无效值时，使用while循环一次又一次地询问用户。

代码：

playGame = raw_input("You want to play game: if yes then enter Y:").upper()
if playGame == "Y":
    print("Ok, here we go.")
    player1 = ''
    while  1:
        player1 = raw_input("Player1, what is your choice, R, P, or S?:").upper()
        if player1 not in ['R', 'P', 'S']:
            print "Invalid answer."
        else:
            break

    player2 = ''
    while 1:
        player2 = raw_input("Player2, what is your choice, R, P, or S?:").upper()       
        if player2 not in ['R', 'P', 'S']:
            print "Invalid answer."
        else:
            break

    print "player1:", player1
    print "player2:", player2

输出：

vivek@vivek:~/Desktop/stackoverflow$ python 7.py
You want to paly game: if yes then enter Y:Y
Ok, here we go.
Player1, what is your choice, R, P, or S?:a
Invalid answer.
Player1, what is your choice, R, P, or S?:R
Player2, what is your choice, R, P, or S?:w
Invalid answer.
Player2, what is your choice, R, P, or S?:q
Invalid answer.
Player2, what is your choice, R, P, or S?:s
player1: R
player2: S

第二个while循环只循环一次

2 个答案: