Try Except Block 正确输入后不通过

Question

我是 Python 和一般编码的新手，并且运行我的代码中有点错误。每当我在我的 Try/Except 代码块中输入错误的输入时，控制台打印 "Invalid input" 但是，每当我在控制台中输入正确的短语时，它仍然显示 "Invalid input"。我在网上查看试图用这些代码行来解决这个问题（用##表示），但我仍然遇到同样的问题。

例如，我会输入大小写正确的 "Mad Libs"，并且仍然会从我的 != 命令中得到 "Invalid input"。这可以通过以不同的方式格式化来轻松解决吗？所有 3 场比赛都会发生这种情况。

如何解决这个问题？提前致谢！

def game_selection(): ##
    pass ##


while True: ##
    try:
        playerChoice = input("So, which game would you like to play?: ")
        if playerChoice != "Mad Libs":
            print("Invalid input")
        elif playerChoice != "Guessing Game":
            print("Invalid input")
        elif playerChoice != "Language Maker":
            print("Invalid input")
        continue ##
    except:
        print("Invalid Input")


game_selection() ##

print("Got it! " + playerChoice + " it is!")
sleep(2)

if playerChoice == "Mad Libs":
    print("Initializing 'Mad Libs'.")
    sleep(.5)
    print("Welcome to MadLibs, " + playerName + "! There are a few simple rules to the game.")
    print("All you have to do is enter in a phrase or word that is requested of you.")
    playerReady = input("Ready to begin? Y/N")

Answer 1

因为你要求它在这段代码中回答无效输入

While True: ##
    try:
        playerChoice = input("So, which game would you like to play?: ")
        if playerChoice != "Mad Libs":
            print("Invalid input")
        elif playerChoice != "Guessing Game":
            print("Invalid input")
        elif playerChoice != "Language Maker":
            print("Invalid input")
        continue ##
    except:
        print("Invalid Input")

Answer 2

问题是，此代码将不起作用，因为如果我输入 "Mad Libs"，第一个 if 将不会通过，因此它将传递给所有其他 elif。所以你不能采用这种方法。我建议你做的是检查 playerChoice 字符串是否在数组中

from time import sleep

while True:
   playerChoice = input("So, which game would you like to play?:")
   allowedGames = ["Mad Libs", "Guessing Game", "Language Maker"]
   if playerChoice not in allowedGames:
      print('Invalid input!')
   else:
      break

print("Got it! " + playerChoice + " it is!")
sleep(2)

if playerChoice == "Mad Libs":
    print("Initializing 'Mad Libs'.")
    sleep(.5)
    print("Welcome to MadLibs, " + playerName + "! There are a few simple rules to the game.")
    print("All you have to do is enter in a phrase or word that is requested of you.")
    playerReady = input("Ready to begin? Y/N")

Try Except Block 正确输入后不通过

Try Except Block not passing after correct input

python

python-3.x

try-except