1.聲明?個(gè)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(diǎn)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:
    __slots__ = ("brand", "color", "ram", "size", "weight")

    def __init__(self, brand, color, ram):
        self.brand = brand
        self.color = color
        self.ram = ram

    def game(self):
        print("使用%s色的%s品牌電腦玩需要用%s內(nèi)存才能玩的游戲" % self.color, self.brand, self.ram)

    def code(self):
        print("使用%s品牌的電腦寫代碼" % self.brand)

    def move(self):
        print("使用%s內(nèi)存的電腦看視頻" % self.ram)


stu1 = Computer("hp", "銀色", "8G")
# 通過對象點(diǎn)獲取
print(stu1.brand)
# 通過對象點(diǎn)方式修改
stu1.brand = "dell"
print(stu1.brand)

stu1.size = "13.3"
print(stu1.size)
# 通過對象點(diǎn)方式刪除
del stu1.brand
print(stu1.brand)
# 通過attr方式獲取
stu2 = input("請輸入獲取的屬性：")
print(getattr(stu1, "%s" % stu2))
# 通過attr方式修改
setattr(stu1, "color", "黑色")
print(stu1.color)
# 通過attr方式刪除
delattr(stu1, "ram")
print(stu1.ram)

2.聲明?個(gè)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:
    def __init__(self, name, age, dog):
        self.name = name
        self.age = age
        self.dog = dog

    def walking_the_dog(self):
        print("%s在溜一條%s的狗" % (self.name, self.dog.dname))


class Dog:
    def __init__(self, dname, dcolor="red", dage="1"):
        self.dname = dname
        self.dcolor = dcolor
        self.dage = dage

    def canine(self):
        print("%s：汪汪汪" % dog1.dname)
#
#
dog1 = Dog("大黃", "black", "2")
dog = dog1
tur1 = Person("小明", "20", dog1)
tur1.walking_the_dog()

3.聲明?一個(gè)圓類，自己確定有哪些屬性和方法

from math import *


class Circle:
    def __init__(self, r):
        self.r = r

    def circumference(self):
        print("以%s為半徑的圓,周長為%s" % (self.r, self.r ** 2 * pi))

    def area(self):
        return ("以%s為半徑的圓,面積為%s" % (self.r, self.r ** 2 * pi))


r1 = Circle(5)
print(r1.area())

4.創(chuàng)建?一個(gè)學(xué)?

生類:

屬性:姓名，年齡，學(xué)號(hào)

方法:答到，展示學(xué)?生信息

創(chuàng)建?一個(gè)班級類:

屬性:學(xué)?生，班級名

方法:添加學(xué)?生，刪除學(xué)生，點(diǎn)名, 求班上學(xué)生的平均年齡

class Student:
    def __init__(self, name, age=0, study_id='000'):
        self.name = name
        self.age = age
        self.study_id = study_id
        self.is_in_class = random.randint(0, 1)

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

    def show(self):
        print('姓名:%s 年齡:%d 學(xué)號(hào):%s' % (self.name, self.age, self.study_id))


class Class:
    def __init__(self, name):
        self.students = []   
        self.name = name

        def func():
            num = 1
            while True:
                yield 'stu'+str(num)
                num += 1
        self.create_id = func()   

    def add_student(self):
        name = input('學(xué)生姓名:')
        age = int(input('學(xué)生的年齡:'))
        study_id = next(self.create_id)
        stu = Student(name, age, study_id)
        self.students.append(stu)

    def del_student(self):
        del_name = input('請輸入要?jiǎng)h除的學(xué)生的名字:')
        flag = False
        for stu in self.students[:]:
            if stu.name == del_name:
                flag = True
                stu.show()
                value = input('是否刪除(y/n):')
                if value == 'y':
                    self.students.remove(stu)
        if not flag:
            print('沒有該學(xué)生!')

    def call_name(self):
        for stu in self.students:
            print(stu.name)
            if stu.is_in_class:
                stu.respond()

    def avg_age(self):
        ages = 0
        for stu in self.students:
            ages += stu.age
        return ages / len(self.students)

    def show_all_students(self):
        print('=========%s的學(xué)生========='%self.name)
        for stu in self.students:
            stu.show()


c1 = Class('py1904')
c2 = Class('py1905')
c1.add_student()    # 001
c1.add_student()    # 002
c2.add_student()    # 001
c1.add_student()    # 003
c1.show_all_students()
c2.show_all_students()