Try Except Block not passing Except

Question

我是Python和编码的新手，在我的代码中遇到了一些bug。每当我在Try/Except代码块中输入错误的输入时，控制台都会打印"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”。我在网上查看了一下，试图用这几行代码解决这个问题(用##表示)，但我仍然得到了同样的问题。

例如，我输入了大小写正确的"Mad Libs“，但仍然从我的!=命令中得到了”无效输入“。通过以不同的方式格式化可以很容易地解决这个问题吗？这在所有3场比赛中都会发生。

如何解决这个问题？提前感谢！

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

问题是，这个代码不会工作，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。我建议您做的是检查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")

Answer 2

因为您要求它在此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")