Question

我正在使用python中的类上的在线教程，然后我想尝试创建一个函数，在其他函数的返回中打印出值。这是代码：

from abc import ABCMeta, abstractmethod

class Vehicle(object):

    __metaclass__ = ABCMeta

    base_sale_price = 0
    wheels = 0

    def __init__(self, miles, make, model, year, sold_on):
        self.miles = miles
        self.make = make
        self.model = model
        self.year = year
        self.sold_on = sold_on

    def sale_price(self):
        if self.sold_on is not None:
            return 0.0
        return 5000.0 * self_wheels

    def purchase_price(self):
        if self.sold_on is None:
            return 0.0
        return self.base_sale_price - (.10 * self.miles)

    def spec(self):
        x = self.sale_price
        y = self.purchase_price

        print "This car should sell at: ", x 
        print "This car should be bought at: ", y

    @abstractmethod
    def vehicle_type():
        pass

class Car(Vehicle):

    base_sale_price = 8000.0
    wheel = 4

    def vehicle_type(self):
        return 'car'

class Truck(Vehicle):

    base_sale_price = 10000.0
    wheels = 4

    def vehicle_type(self):
        return 'truck'

AE86 = Truck(4, 35000, 'Toyota', 'AE86', 1986, )
print AE86.sale_price()

这就是我得到的： This car should sell at: <bound method Truck.sale_price of <__main__.Truck object at 0x10666da50>> This car should be bought at: <bound method Truck.purchase_price of <__main__.Truck object at 0x10666da50>>

我做错了什么？如何使方法的返回值显示？

Answer 1

看起来你在def sale_price(self):

中输了一个拼写错误

return 5000.0 * self.wheels不是return 5000.0 * self_wheels

在def spec(self):中你没有调用类方法。

def spec(self):
    x = self.sale_price()
    y = self.purchase_price()
    print "This car should sell at: ", x 
    print "This car should be bought at: ", y

如何在类中打印方法的返回值？

1 个答案: