使用python回答yes或no问题的第三个答案

Question

不熟悉python并创建了我的第一个程序。我试过运行它，一切正常，但我想在“是”或“否”问题上添加第三个选项。所以，如果他们说答案是“驼鹿”，我能让程序拒绝这个答案，然后再问这个问题吗？你知道吗

任何帮助都将不胜感激。你知道吗

#Is it raining outside?

raining = "yes"
umbrella = "yes"
stillraining = "yes"
israining = "yes"
spacestation ="yes"#This was supposed to be "haveumbrella", but for some reason that's not allowed but "spacestation" is?
print("Is it raining outside?")
print("")
isitraining = input()
if isitraining == "no":#Ask user if it is raining, if not, tell them to "Go outside" followed by exit statement
    print("")
    print("Go outside")
    import sys
    exit()
elif isitraining == "yes": #It is raining
    print("")
    print("Do you have an umbrella?") #Ask if they have an umbrella
    print("")
    spacestation = input()
    if spacestation == "no":#If answer is no, tell them to "Stay inside and wait."
        print("")
        print("Stay inside and wait.")
        print("")
        while stillraining == "yes":  # Ask use if it is still raining outside. 
            print("Is it still raining outside?")
            stillraining = input()
            print("")
            print("Stay inside and wait")
            print("")
        if stillraining == "no": 
            print("")
            print("Go outside")
            exit()
    elif spacestation == "yes":#If answer is yes, tell them to "Go outside."
        print("")
        print("Go outside.")
        exit()

Answer 1

创建一个选项列表user\u input=['yes'、'yes'、'Y'、'No'、'N'、'No']并选中 如果输入是在用户输入：，如果是，那么继续你的代码，否则打破程序和打印错误的输入。你知道吗

或者，也可以使用Try和Except。你知道吗