1.聲明一個電腦類千劈，屬性：品牌、顏色针饥、內(nèi)存大畜猿伞；方法：打游戲漓帅、寫代碼锨亏、看視頻

a.創(chuàng)建電腦類的對象，然后通過對象點的方式獲取忙干、修改器予、添加和刪除它的屬性

b.通過attr相關(guān)方法去獲取、修改捐迫、添加和刪除它的屬性乾翔。

class Computer:

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

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


    def write_code(self):
        print('用%s寫代碼' % (self.band))


    def watch_video(self):
        print('用%s看視頻' % (self.band))

2.聲明一個人的類和狗的類，狗的屬性：名字施戴、顏色反浓、年齡；狗的方法：叫喚暇韧；人的屬性：名字勾习、年齡、狗懈玻；人的方法：遛狗巧婶。

a.創(chuàng)建人的對象，小明涂乌，讓他擁有一條大黃狗艺栈，然后讓小明去遛大黃狗。

class Dog:

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

    def dog_bark(self):
        print('%s在叫喚' % (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.聲明一個圓類

class Circle:

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

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

4.聲明一個學(xué)生類湾盒，屬性：姓名湿右、年齡、學(xué)號罚勾，方法：答到毅人，展示學(xué)生信息

創(chuàng)建一個班級類吭狡，屬性：學(xué)生，班級名丈莺；方法：添加學(xué)生划煮，刪除學(xué)生，點名缔俄，求班上學(xué)生的平均年齡弛秋。

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():
    # 第一題
    compuer1 = Computer('戴爾','黑色','256G')
    print(compuer1.band, compuer1.color, compuer1.memory)
    compuer1.play_game()
    compuer1.write_code()
    compuer1.watch_video()
    print('============================================')
    print(compuer1.band)  # 獲取
    compuer1.band = 'Dell' # 修改
    print(compuer1.band)
    compuer1.name = '小黑' # 添加
    print(compuer1.name)
    del compuer1.band # 刪除
    print(compuer1.__dict__)
    print('============================================')
    print(getattr(compuer1,'band','不存在'))
    print(getattr(compuer1,'name','不存在')) # 獲取
    setattr(compuer1,'name','小紅')
    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('====================第二題========================')

def main2():
    dog1 = Dog('大黃', '黃色', 2)
    print(dog1.__dict__)

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

    print(p1.walk_the_dog())

    print(('====================第三題========================'))

def main3():
    c1 = Circle(20)
    print(c1.__dict__)
    print(c1.area())
    print(('====================第四題========================'))

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


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