类的Python代码不返回值

Question

你好，我有一个 python 代码不断给我一个错误，在我继续之前有人可以看看它。这是为了让我的 python 类计算手机账单金额。我现在有这个但它没有返回值

经济计划包括 30 美元的无限语音和文本、10 美元的 1 GB 数据和每 GB 6 美元。

正常计划包括 30 美元的无限制语音和文本、5 GB 数据（30 美元）和每 GB 4 美元。

class cellphone:
    cost = 30
    due = 0
    amountGB = 0
    Total = 0

    def econPlan (self, gB, gbOver):
        self.cost = 30
        self.gB = 1
        self.gbOver = 6
        self.due = 0

        while amountGB >= self.gB:
            int(amountGB - self.gB)* self.gbOver
        return self.due

        while cPlan == Econ and amountGB >= self.gB:
            print ("$",self.due)

    def normPlan (self, gB, gbOver):
        self.cost = 30
        self.gB = 5
        self.gbOver = 4

        while amountGB >= self.gB:
            int(amountGB - self.gB)* self.gbOver
        return self.due

        while cPlan == Norm and amountGB >= self.gB:
            print ("$",self.due)






print (" Which Plan do you have: econ or norm?")
print (" Econ is $30 unlimited voice and text, 1 GB data for $10, and $6 for every GB over.")
print (" Norm is $30 unlimited voice and text, 5 GB data for $30, and $4 for every GB over.")

econ = cellphone.econPlan
norm = cellphone.normPlan
cellphone.cPlan = input ("So which plan do you have? >>")
if cellphone.cPlan == econ:
    print ("you have the Economy plan")

elif cellphone.cPlan == norm:
    print ("you have the Normal plan")

cellphone.amountGB = input ("how many GB did you used >>")
if cellphone.cPlan == "Econ":
    print (cellphone.due)

Answer 1

Self 只存在于方法中。如果要在方法中获取变量的当前值，请调用该方法并返回该变量。