作业1

"""
1.学生类。属性：姓名、年龄、成绩（语文、数学、英语）
          方法：a.获取学生名字， b.获取学生年龄， c.返回3门成绩的最高分

"""


class Student:
    def __init__(self, name='', age=0, score=[]):
        self.name = name
        self.age = age
        self.score = score

    def getname(self):
        return self.name

    def getage(self):
        return self.age

    def get_course(self):
        max_score = self.score[0]
        for item in self.score:
            if max_score['score'] < item['score']:
                max_score = item
        return max_score


if __name__ == '__main__':
    score = [{'name': 'math', 'score': 90}, {'name': 'english', 'score': 84}, {'name': 'language', 'score': 87}]
    stu = Student('xxx', 12, score)
    print(stu.getname())
    print(stu.getage())
    print(stu.get_course())

作业2

"""
2.汽车类Auto。属性：轮胎个数，汽车颜色，车身重量，速度，通过不同的构造方法创建实例
          方法：a.加速， b.减速， c.停车
  小汽车类CarAuto继承Auto,添加属性：空调、CD；  覆盖加速 减速方法

"""


class Auto:
    def __init__(self, tires=4, color='', weight=600, speed=0):
        self.tires = tires
        self.color = color
        self.weight = weight
        self.speed = speed

    def speed_up(self, speed=3):
        self.speed += speed

    def speed_down(self, speed=3):
        if self.speed <= speed:
            self.speed = 0
        else:
            self.speed -= speed

    def stop(self):
        self.speed = 0


class CarAuto(Auto):
    def __init__(self, air_conditioner='', cd=''):
        super().__init__()
        self.air_conditioner = air_conditioner
        self.CD = cd

    def speed_up(self, speed=3):
        self.speed += speed
        print('小汽车在加速')

    def speed_down(self, speed=3):
        if self.speed <= speed:
            self.speed = 0
        else:
            self.speed -= speed
            print('小汽车在减速')


if __name__ == '__main__':
    auto1 = Auto(5, 'red')
    auto2 = Auto(5, 'gray', speed=45)
    auto2.speed_up(10)
    auto2.speed_down(20)
    auto2.stop()

    car = CarAuto()
    car.speed_up(10)
    car.speed_down(20)
    car.stop()

作业3

"""
3.User类。属性：firstname,lastname,用户简介（存用户其他属性）
          方法：a.describeuser():打印用户信息， b.greetuser()向用户发出个性化问候
  Admin类：属性：继承user类。privileges=[]; 方法：show_privileges()显示用户权限
要求：创建Admin实例，并调用show_privileges()这个方法

"""


class User:
    def __init__(self, firstname, lastname):
        self.firstname = firstname
        self.lastname = lastname
        self.abstract = []

    def describeuser(self):
        print('firstname:%s, lastname:%s' % (self.firstname, self.lastname), end=',')
        print(self.abstract)

    def greetuser(self):
        print('你好，...欢迎您！')


class Admin(User):
    def __init__(self, firstname, lastname, privileges=[]):
        super().__init__(firstname, lastname)
        self.privileges = privileges

    def show_privileges(self):
        print('%s %s的权限有：%s' % (self.firstname, self.lastname, self.privileges))


if __name__ == '__main__':
    admin = Admin('zhang', 'san', ['can add post', 'can delete post', 'can ban user'])
    admin.show_privileges()

作业4

"""
4.创建⼀一个Person类，添加⼀一个类字段⽤用来统计Perosn类的对象的个数 
"""
class Person:
    number = 0
    
    def __init__(self):
        Person.number += 1
        
    def __del__(self):
        Person.number -= 1