是没有答案系统/游戏的问题，如果是python的话

Question

我希望程序根据上一个问题的答案提出一个新问题。几次。我可能完全做错了（我是菜鸟，想学习）

Q1 = input("stripes? answer yes or no: ")
if Q1 == "yes":
    Q2 = input("horizontal stripes? answer yes or no: ")
if Q1 == "no":
    Q3 = input("is there a cross? answer yes or no: ")
if Q2 == "yes":
    Q4 = input("is there 3 difrent colors or more? answer yes or no: ")
if Q2 == "no":
    Q5 = input("dose it have some sort of crest? answer yes or no : ")
if Q3 == "yes":
    Q6 = input("is ther 3 different colors or more? answer yes or no: ")
if Q3 == "no":
    Q7 = input(" is ther a red background color? answer yes or no: ")

如果我回答第一个问题“否”，第二个回答“是”，则会出现以下错误：NameError: name "Q2" is not defined。

效果很好，直到我添加了最后两个ifs。谢谢您的回答，对您的拼写错误表示抱歉，我患有阅读障碍。

Answer 1

您必须阅读有关conditional statements in python。有一个非常好的东西叫做else。我已经重写了您所做的事情：

Q1 = input("stripes? answer yes or no: ")
if Q1 == "yes":
    Q2 = input("horizontal stripes? answer yes or no: ")
    if Q2 == "yes":
        Q4 = input("is ther 3 difrent colors or more? answer yes or no: ")
    else:
        Q5 = input("dose it have som sort of crest? answer yes or no : ")
else:
    Q3 = input("is ther a cross? answer yes or no: ")
    if Q3 == "yes":
        Q6 = input("is ther 3 difrent colors or more? answer yes or no: ")
    else:
        Q7 = input("is ther a red bakround color? answer yes or no: ")

Answer 2

您发生错误，因为如果对Q1输入输入'是'，则Q2尚未初始化。根据@pythad的答案使用条件语句。

此外，您可以使用一个类来表示您的问题（可能是订购单的一部分...），从而使其更具可伸缩性。

class OrderForm():
    def __init__(self):
        self.questions = {1:"stripes?", 
                          2:"horizontal stripes?",
                          3:"is there a cross? ",
                          4:"is there 3 different colors or more?",
                          5:"does it have some sort of crest?",
                          6:"is there 3 different colors or more?",
                          7:"is there a red background color?"
                          }
        self.responses = {k:'' for k in self.questions.keys()}

    def ask(self, q):
        try:
            a = input(self.questions[q] + " answer yes or no: ")
            a = a.lower().strip()
            self.responses[q] = a if a in ['yes','no'] else ''
        except:
            # no response given
            self.responses[q] = None
        return self.responses[q]

def foo():
    form = OrderForm()
    if not form.ask(1):
        print('Q1 is required...')
        return
    else:
        with form.responses[1] as Q1:
            if Q1 == 'yes':
                form.ask(2)
                if form.responses[2] == 'yes':
                    form.ask(4)
                else:
                    form.ask(5)
            elif Q1 == 'no':
                form.ask(3)
                if form.responses[3] == 'yes':
                    form.ask(6)
                else:
                    form.ask(7)

            print('\n'.join(['Q{} '.format(i) + form.questions[i] + '\t' + form.responses[i] for i in range(1, len(form.questions)+1)]))