day15作业

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

class Computer:
    def __init__(self,brand='神舟',color='七彩色',memsize='512TB'):
        self.brand = brand
        self.color = color
        self.memsize = memsize

    def __repr__(self):
        return '<' + str(self.__dict__)[1:-1] + ' at ' + hex(id(self)) + '>'

    def game(self):
        print('%s可以打游戏' % self)

    def game(self):
        print('%s可以写代码' % self)

    def game(self):
        print('%s可以看视频' % self)

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

c1 = Computer()

print('==================获取================')
# 获取c1的品牌信息
print(c1.brand)

print('==================修改================')
# 把c1的品牌修改为Mac
c1.brand = 'Mac'

print('==================添加================')
# 添加c1的显卡属性，是2080Ti
c1.gpu = '2080Ti'

print('==================删除================')
# 删除c1的颜色属性
del c1.color

b.通过attr相关方法去获取、修改、添加和删除它的属性

c1 = Computer()

print('==================获取================')
# 获取c1的品牌信息
getattr(c1,'brand')

print('==================修改================')
# 把c1的品牌修改为Mac
setattr(c1,'brand','Mac')

print('==================添加================')
# 添加c1的显卡属性，是2080Ti
setattr(c1,'gpu','2080Ti')

print('==================删除================')
# 删除c1的颜色属性
delattr(c1,'color')

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

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

    def call(self):
        print('%s在叫，喵' % self.name)



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

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

a.创建人的对象小明，让他拥有一条狗大黄，然后让小明去遛大黄

p1 = Person('小明', 10, '大黄')
p1.walk_the_dog()

3.声明一个圆类:

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

4.创建一个学生类:

属性:姓名，年龄，学号
方法:答到，展示学生信息

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

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

    def __repr__(self):
        return '✪' + str(self.__dict__)[1:-1] + ' at ' + hex(id(self)) + '✪'

s1 = Student('lilei', 12, 7651)
s1.ask_dao()
print(s1)

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 Class:
    # 声明班级类
    def __init__(self, class_name, student = []):
        self.class_name = class_name
        self.student = student

    # 用学生类给班级类的学生赋值
    def add_stu(self, name, age, id, score):
        stu = Student(name, age, id, score)
        self.student.append(stu)

    # 删除学生
    def del_stu(self,name):
        for stu in self.student:
            if name == stu.name:
                self.student.remove(stu)
                return
        else:
            print('没有该学生')
            return

    # 班上学生的平均年龄
    def average_age(self):
        sum = 0
        for stu in self.student:
            sum += stu.age
        average_age = sum/len(self.student)
        print(average_age)

c1 = Class(1809)
c1.add_stu('lilei', 12, 7651, 80)
c1.add_stu('hanmeimei', 11,7652,41)
print(c1.student)
c1.del_stu('lilei')
print(c1.student)
c1.average_age()