Day15-Python-作业-2019/01/11

1.声明一个电脑类，属性：品牌、颜色、内存大小；方法：打游戏、写代码、看视频

a.创建电脑类的对象，然后通过对象点的方式获取、修改、添加和删除它的属性

b.通过attr相关方法去获取、修改、添加和删除它的属性。

class Computer:

    def __init__(self,band,color,memory):
        self.band = band
        self.color = color
        self.memory = memory

    def play_game(self):
        print('用%s打游戏' % (self.band))


    def write_code(self):
        print('用%s写代码' % (self.band))


    def watch_video(self):
        print('用%s看视频' % (self.band))

2.声明一个人的类和狗的类，狗的属性：名字、颜色、年龄；狗的方法：叫唤；人的属性：名字、年龄、狗；人的方法：遛狗。

a.创建人的对象，小明，让他拥有一条大黄狗，然后让小明去遛大黄狗。

class Dog:

    def __init__(self,name,color,age):
        self.name = name
        self.color = color
        self.age = age

    def dog_bark(self):
        print('%s在叫唤' % (self.name))

class Person:

    def __init__(self,name,age,dog):
        self.name = name
        self.age = age
        self.dog = dog

    def walk_the_dog(self):
        return '%s在遛%s' % (self.name, self.dog)

3.声明一个圆类

class Circle:

    def __init__(self,radius:int):
        self.radius = radius

    def area(self):
        return 0.25 * (self.radius**2) * 3.14

4.声明一个学生类，属性：姓名、年龄、学号，方法：答到，展示学生信息

创建一个班级类，属性：学生，班级名；方法：添加学生，删除学生，点名，求班上学生的平均年龄。

class Student:
    def __init__(self, stu_name, age, id):
        self.name = stu_name
        self.age = age
        self.id = id


    def show_stu_info(self):
        return self.__dict__

    def reply(self):
        pass

class The_class:
    def __init__(self,class_name,student):
        self.class_name = class_name
        self.student = student

    @staticmethod
    def add_stu(*args):
        return Student(*args)

    @classmethod
    def del_stu(cls,*args):
        pass


    def answer(self):
        pass

    def average_age(self):
        pass

def main():
    # 第一题
    compuer1 = Computer('戴尔','黑色','256G')
    print(compuer1.band, compuer1.color, compuer1.memory)
    compuer1.play_game()
    compuer1.write_code()
    compuer1.watch_video()
    print('============================================')
    print(compuer1.band)  # 获取
    compuer1.band = 'Dell' # 修改
    print(compuer1.band)
    compuer1.name = '小黑' # 添加
    print(compuer1.name)
    del compuer1.band # 删除
    print(compuer1.__dict__)
    print('============================================')
    print(getattr(compuer1,'band','不存在'))
    print(getattr(compuer1,'name','不存在')) # 获取
    setattr(compuer1,'name','小红')
    print(getattr(compuer1,'name','不存在')) # 修改
    setattr(compuer1,'band','Dell') # 添加
    print(compuer1.__dict__)
    delattr(compuer1,'band')
    print(compuer1.__dict__)
    print('====================第二题========================')

def main2():
    dog1 = Dog('大黄', '黄色', 2)
    print(dog1.__dict__)

    p1 = Person('小明', 13, dog1.name)
    print(str(p1.__dict__)[1:-1])

    print(p1.walk_the_dog())

    print(('====================第三题========================'))

def main3():
    c1 = Circle(20)
    print(c1.__dict__)
    print(c1.area())
    print(('====================第四题========================'))

def main4():
    student1 = Student('小明', 13, 1809)
    student2 = Student('小王', 15, 1808)
    student3 = Student('小红', 17, 1807)
    class1 = The_class('第一班',student1)
    print(class1.student.name)


if __name__ == '__main__':
    main()
    main2()
    main3()
    main4()