正确输入后尝试除块未通过

Question

我是 Python 和一般编码的新手，并且在我的代码中遇到了一些错误。 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“无效输入”但是，每当我在控制台中输入正确的短语时，它仍会显示“无效输入”。 我在网上查看以尝试使用这些代码行解决此问题（用## 表示），但我仍然遇到相同的问题。

例如，我会用正确的大小写和所有内容输入“Mad Libs”，但仍然从我的 != 命令中得到“无效输入”。 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

因为您在此代码中要求它无论如何回答无效输入

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。 所以你不能采取这种方法。 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")