我如何使用while循环将N个用户输入添加到列表中？

Question

question = ""
while question not in questionList:
    question = questionList.append(input("Whats your question? "))
    if question in questionList:
        break
    elif question == "none":
        break

我想做的是让用户反复问一个问题，直到输入“无”或直到他们重复自己为止。他们输入的内容应该放入“ questionList”列表中，唯一的问题是我的代码无论如何都不会中断。如何使while循环中断？

Answer 1

question = "_"
questionList=[]
while question != "":
    question = str(input("Whats your question? "))
    if question == None or question in questionList:
        break
    questionList.append(question) # returns None

Answer 2

主要问题是questionList.append()总是返回None，而您的代码似乎假定它返回了其参数。改写如下：