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GitHub Repository: jackfrued/Python-100-Days
 Path: blob/master/Day01-15/code/Day09/car2.py
Views: 729
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"""

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属性的使用

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- 使用已有方法定义访问器/修改器/删除器

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Version: 0.1

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Author: 骆昊

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Date: 2018-03-12

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"""

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class Car(object):

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    def __init__(self, brand, max_speed):

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        self.set_brand(brand)

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        self.set_max_speed(max_speed)

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    def get_brand(self):

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        return self._brand

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    def set_brand(self, brand):

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        self._brand = brand

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    def get_max_speed(self):

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        return self._max_speed

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    def set_max_speed(self, max_speed):

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        if max_speed < 0:

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            raise ValueError('Invalid max speed for car')

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        self._max_speed = max_speed

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    def __str__(self):

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        return 'Car: [品牌=%s, 最高时速=%d]' % (self._brand, self._max_speed)

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    # 用已有的修改器和访问器定义属性

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    brand = property(get_brand, set_brand)

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    max_speed = property(get_max_speed, set_max_speed)

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car = Car('QQ', 120)

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print(car)

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# ValueError

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# car.max_speed = -100

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car.max_speed = 320

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car.brand = "Benz"

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print(car)

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print(Car.brand)

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print(Car.brand.fget)

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print(Car.brand.fset)

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