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?方法去獲取、修改、添加和刪除它的屬性

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


    def function(self):
        print('打游戲')
        print('寫代碼')
        print('看視頻')

c = Computer('華碩', '白色', '16GB')
c.function()
print(c.brand, c.color, c.memory)
c.brand = '戴爾'
c.color = '黑色'
c.memory = '8GB'
print(c.brand, c.color, c.memory)
del c.color
setattr(c, 'GPU', 'NVIDA')
print(c.GPU)
delattr(c.brand)
print(c.brand)

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

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


dog1 = Dog('大黃', '黃色', 5)
print(dog1.name, dog1.color, dog1.age)
dog1.call_out()


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

        def walk_dog(self):
        print('%s 遛' % self.name, dog1.name)

p1 = Person('小明', 18, dog1.name)
print(p1.name, p1.age, p1.dog)
p1.walk_dog()

3.聲明?一個圓類，自己確定有哪些屬性和方法

class Circle:
from math import pi
    def __init__(self,r):
        self.r = r

    #面積
    def area(self):
        area1 = pi * c.r * c.r
        print(area1)

    #周長
    def perimeter(self):
        per = 2 * pi * c.r
        print(per)

    #直徑
    def diameter(self):
        dia = 2 * c.r
        print(dia)

c = Circle(10)
print(c.r)
c.area()
c.perimeter()
c.diameter()

4.創(chuàng)建?一個學?生類:

屬性:姓名，年齡，學號

方法:答到，展示學?生信息

#學生類
class Student:
    def __init__(self, name, age, study_id):
        self.name = name
        self.age = age
        self.study_id = study_id

    def answer(self):
        print('%s 到！' % self.name)

    def info(self):
        print(stu1.name, stu1.age, stu1.study_id)

stu1 = Student('小明', 18, '1001')

stu1.answer()
stu1.info()

創(chuàng)建?一個班級類:

屬性:學?生，班級名

方法:添加學?生，刪除學生，點名, 求班上學生的平均年齡

class Classes:
    def __init__(self, student, class1):
        self.student = student
        self.class1 = class1

    def add_student(self):
        with open('files/students', 'a', encoding='utf-8') as f:
            f.write(self.student)
            f.write(self.class1)

    def del_student(self):
        with open('files/students', '', encoding='utf-8') as f:
            f.__delattr__(self.student)


Class_stu1 = Classes('張三', 'Class 1')
Class_stu2 = Classes('李四', 'Class 2')

Class_stu1.add_student()
Class_stu2.add_student()

Class_stu1.del_student()