1.聲明?個電腦類: 屬性:品牌、顏?、內(nèi)存?小 方法:打游戲、寫代碼、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、修改、添加和刪除它的屬性
b.通過attr相關(guān)?方法去獲取、修改、添加和刪除它的屬性

class Computer:
    def __init__(self, brand, color, memory_size):
        self.brand = brand
        self.color = color
        self.memory_size = memory_size

    def play_game(self):
        print('打游戲')

    def write_code(self):
        print('敲代碼')

    def watch_tv(self):
        print('看電視')
        
        
# a.
c1 = Computer('lenovo', 'black', '500G')
print(c1.brand)  # lenovo
c1.color = 'white'
c1.type = 'Thinkpad'
print(c1.color, c1.type)  # white Thinkpad
del c1.type
# print(c1.type)  # AttributeError: 'Computer' object has no attribute 'type'
# b.
print(getattr(c1, 'brand'))   # lenovo
setattr(c1, 'color', 'white')
setattr(c1, 'type', 'Thinkpad')
print(c1.color, c1.type)  # white Thinkpad
delattr(c1, 'type')
# print(c1.type)  # AttributeError: 'Computer' object has no attribute 'type'

2.聲明?個人的類和狗的類:
狗的屬性:名字、顏?色、年年齡
狗的?方法:叫喚
人的屬性:名字、年年齡、狗
人的?方法:遛狗
a.創(chuàng)建?人的對象?小明，讓他擁有?一條狗?大?黃，然后讓?小明去遛?大?黃

class Person:
    """
    人的一個類
    name：人的姓名
    age：人的年齡
    dog：人的狗
    """
    __slots__ = ('name', 'age', 'dog')

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

    def walk_the_dog(self):
        print('%s溜他的%s' % (self.name, self.dog.name))


class Dog:
    """
    狗的一個類
    name: 狗的名字
    age: 狗的年齡
    color：狗的顏色
    """
    __slots__ = ('name', 'age', 'color')

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

    def call_out(self):
        print('%s,汪汪汪' % self.name)


dog1 = Dog('大黃', '黃色', 2)
p1 = Person('小明', 18, dog1)
p1.walk_the_dog()
print(p1.dog.age)

3.聲明?一個圓類，自己確定有哪些屬性和方法

from math import pi

class Circle:
    """
    圓的一個類
    radius:半徑
    area：求圓的面積
    perimeter:求圓的周長
    """
    def __init__(self, radius):
        self.radius = radius

    def area(self):
        return pi*self.radius**2

    def perimeter(self):
        return 2*pi*self.radius


circle1 = Circle(5)
print(circle1.area())
print(circle1.perimeter())

4.創(chuàng)建?一個學(xué)?生類:
屬性:姓名，年齡，學(xué)號
方法:答到，展示學(xué)?生信息

創(chuàng)建?一個班級類:
屬性:學(xué)?生，班級名
方法:添加學(xué)?生，刪除學(xué)生，點名, 求班上學(xué)生的平均年齡

class Student:
    __slots__ = ('name', 'age', 'study_id')

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

    def massage(self):
        print('到，我叫%s,今年%d歲，學(xué)號是%s' % (self.name, self.age, self.study_id))


class Class:

    def __init__(self, class_name, *students):
        self.name = class_name
        self.students = list(students)

    def add_student(self, student):  # 添加學(xué)生
        self.students.append(student)
        return

    def del_student(self, student):  # 刪除學(xué)生
        self.students.remove(student)

    def call_the_roll(self):  # 點名
        for student in self.students:
            print(student.name)
        return

    def ave_age(self):  # 平均年齡
        sum_age = 0
        for student in self.students:
            sum_age += student.age
        return sum_age/len(self.students)


if __name__ == '__main__':
    s1 = Student('小明', 18, '001')
    s2 = Student('小畫', 13, '002')
    s3 = Student('小度', 21, '003')
    class1 = Class('py1904', s1)
    class1.add_student(s2)
    class1.add_student(s3)
    class1.add_student(Person('小張', 17, '004'))
    class1.call_the_roll()
    print(class1.ave_age())