python 类变量定义问题

Question

我刚刚开始学习类(class)，主要是通过阅读这里 https://pythonprogramming.net/classes-python-3-basics-tutorial/

我也尝试在类之间进行分支，但出于某种原因当我到达 result 类时我收到一个错误，指出成本未定义。有人可以告诉我我做错了什么吗？

class calculator():
    def money(self):
        print("What was the cost?")
        cost = input("> ")
        diners.amount_of_diners()

class diners():
    def amount_of_diners():
        print("How many people are with you?")
        diners = input("> ")
        precent.precent_to_give()

class precent():
    def precent_to_give():
        print("How much '%' you want to give the waiter? ")
        prec = input("> ")
        result.the_end()

class result():
    def the_end():
        print("The total amount of money each of you need have to give is: ",cost * diners)



calc = calculator()
calc.money()

Answer 1

Cost 是 Money() 的局部变量，并且无法被 result() 访问