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

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对象之间的依赖关系和运算符重载

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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._brand = brand

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        self._max_speed = max_speed

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        self._current_speed = 0

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    @property

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    def brand(self):

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        return self._brand

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    def accelerate(self, delta):

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        self._current_speed += delta

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        if self._current_speed > self._max_speed:

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            self._current_speed = self._max_speed

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    def brake(self):

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        self._current_speed = 0

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    def __str__(self):

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        return '%s当前时速%d' % (self._brand, self._current_speed)

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class Student(object):

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    def __init__(self, name, age):

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        self._name = name

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        self._age = age

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    @property

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    def name(self):

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        return self._name

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    # 学生和车之间存在依赖关系 - 学生使用了汽车

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    def drive(self, car):

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        print('%s驾驶着%s欢快的行驶在去西天的路上' % (self._name, car._brand))

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        car.accelerate(30)

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        print(car)

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        car.accelerate(50)

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        print(car)

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        car.accelerate(50)

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        print(car)

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    def study(self, course_name):

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        print('%s正在学习%s.' % (self._name, course_name))

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    def watch_av(self):

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        if self._age < 18:

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            print('%s只能观看《熊出没》.' % self._name)

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        else:

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            print('%s正在观看岛国爱情动作片.' % self._name)

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    # 重载大于(>)运算符

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    def __gt__(self, other):

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        return self._age > other._age

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    # 重载小于(<)运算符

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    def __lt__(self, other):

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        return self._age < other._age

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if __name__ == '__main__':

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    stu1 = Student('骆昊', 38)

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    stu1.study('Python程序设计')

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    stu1.watch_av()

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    stu2 = Student('王大锤', 15)

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    stu2.study('思想品德')

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    stu2.watch_av()

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    car = Car('QQ', 120)

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    stu2.drive(car)

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    print(stu1 > stu2)

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    print(stu1 < stu2)

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