在此 while 循環中，如何不接受除“是”或“否”以外的任何字符串值

Question

我對編程很陌生，所以請原諒這個愚蠢的問題。 我如何進行這個循環，以便如果該人輸入一個隨機字符串（不是是或否），它將返回“無效響應”？

name = input("What's your name? ")
understanding = input("{}, do you understand while loops in python\n(Yes or No)? ".format(name))


while understanding.lower() != 'yes':
    print("Ok, {}, while loops in Python repeat as long as a certain Boolean condition is met.".format(name))
    understanding = input("{}, now do you understand Python while loops?\n(Yes or No)? ".format(name))
print("Great news {}! It's good to hear that you understand these loops now! Let's move on!".format(name))

Answer 1

也許像這樣

if understanding.lower() not in ('yes','no'):
    print('Invalid response')