2019-01-11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
a.创建电脑类的对象，然后通过对象点的⽅方式获取、修改、添加和删除它的属性
b.通过attr相关⽅方法去获取、修改、添加和删除它的属性

class Computer:
    def __init__(self, brand: str, color: str, storage=0):
        self.brand = brand
        self.color = color
        self.storage = storage

    def play(self,game):
        print('玩儿%s' % game)
    @staticmethod
    def write(self):
        print('用%s写代码' % self.brand)
    @staticmethod
    def see(self):
        print('看%s' % video)

def main():
    # a.
    c1 = Computer('三星', '白色', '8G')
    c2 = Computer('苹果', '黑色', '16G')
    print(c1.brand, c1.color, c1.storage)
    c2.color = '蓝色'
    print(c2.brand, c2.color, c2.storage)
    print(getattr(c1,'storage',13))
    print(setattr(c1, 'weight', 200))
    print(c1.weight)
    del c1.brand
    delattr(c2,'color')
    print(getattr(c2,'color',None))

2.声明⼀个人的类和狗的类:
狗的属性: 名字、颜⾊色、年年龄
狗的⽅方法: 叫唤
人的属性: 名字、年年龄、狗
人的⽅方法: 遛狗
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

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

    def bark(self):
        return 'wang!wang!wang!'
def main():
    p1 = Person('小明', 18)
class Person:
    def __init__(self, name='', age=0,dog:Dog=None):
        self.name = name
        self.age = age
         self.dog = dog
  def playDog(self):
        if self.dog:
           print('%s牵着%s在外面散步' % (self.name,               
        self.dog.name))
        else:
            print('没有🐶！遛自己！')

3.声明⼀一个圆类:

class YTValueError(Exception):
    def __init__(self):
        return '输入错误'
class circle:
pi=3.14159265357
    def __init__(self, x: float, y: float, r: float):
        self.x = x
        self.y = y
        self.r = r
        self._area=0
        self._perimeter=0
    @property
         def area(self):
        return self.r**2*Circle.pi
    @area.setter
    def area(self,value):
        raise YTValueError

    def area(self):
        return self.r**2*Circle.pi
    def perimetrer(self):
        return 2*Circle.pi*Circle.r

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, number):
self.name = name
self.age = age
self.number = number

def method(self):
    return '答到'

def method1(self):
    return '展示信息'

class Class:
stu = []

def __init__(self, student, class_name):
    self.student = student
    self.class_name = class_name

@classmethod
def add_student(self):
    print('添加学生！')
    Student.name=input('姓名：')
    Student.age=input('年龄：')
    print(Class.stu)

@classmethod
def del_student(self):
    d = input('删除学生')
    Class.stu.remove(d)
    print(Class.stu)

创建⼀一个班级类:
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