2018-09-06day14面向对象作业

1.声明一个电脑类: 属性:品牌、颜色、内存 方法:打游戏、写代码、看视频

class Computer:
    def __init__(self,brand = "华硕",color = "黑色",memory = 256):
        self.brand = brand
        self.color = color
        self.memory = memory
    @classmethod
    def play_game(cls):
        print("打游戏")
    @classmethod
    def write_code(cls):
        print("写代码")
    @classmethod
    def see_video(cls):
        print("看视频")
com1 = Computer()
print("品牌:%s,颜色:%s,内存:%s" % (com1.brand,com1.color,com1.memory))
# 方法a 获取
print("品牌：%s" % com1.brand)
# 修改
com1.color = "银色"
print("颜色：%s" % com1.color)
#添加
com1.run_memory = "8G"
print("运行内存:%s" % com1.run_memory)
#删除
del com1.memory
#方法b获取
print(getattr(com1,"brand"))
#修改
setattr(com1,"brand","戴尔")
print("品牌:%s" % com1.brand)
#添加
setattr(com1,"screen_size",15.6)
print("屏幕大小:%s" % com1.screen_size)
#删除
delattr(com1,"run_memory")
com1.play_game()
com1.write_code()
com1.see_video()
输出:
品牌:华硕,颜色:黑色,内存:256
品牌：华硕
颜色：银色
运行内存:8G
华硕
品牌:戴尔
屏幕大小:15.6
打游戏
写代码
看视频

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
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

class Person:
    def __init__(self,name,age,dog):
        self.name = name
        self.age = age
        self.dog = dog
    @classmethod
    def walk_dog(cls):
        tc = cls()
        tc.walk_dog()
class Dog:
    def __init__(self,name,color,age):
        self.name = name
        self.color = color
        self.age = age
    @classmethod
    def dogs(cls):
        print("汪 汪汪")

p1 = Person("小明",20,"大黄")
dog1 = Dog("大黄","黄色",3)

print("{}在遛{}".format(p1.name,p1.dog))
dog1.dogs()
输出:
小明在遛大黄
汪 汪汪

3.声明一个矩形类：
属性：长、宽 方法：计算周长和面积
a.创建不同的矩形，并且打印其周长和面积

class Rect:
    def __init__(self,length1,width1):
        self.length = length1
        self.width = width1
    def area(self):
        return self.length * self.width
    def meter(self):
        return 2*(self.length + self.width)

r1 = Rect(4,5)
print("r1的面积：",r1.area())
print("r1的周长:",r1.meter())

r2 = Rect(7,8)
print("r2的面积：",r2.area())
print("r2的周长:",r2.meter())
输出:
r1的面积： 20
r1的周长: 18
r2的面积： 56
r2的周长: 30

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
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

class Student:
    def __init__(self,name,age,id):
        self.name = name
        self.age = age
        self.id = id
    def answer(self):
        print("%s:到" % self.name)
    def show(self):
        print("姓名：%s,年龄:%d,学号:%s" % (self.name,self.age,self.id))
class PythonClass:
    def __init__(self,class_name):
        self.class_name = class_name
        self.students = []
    def add_student(self,student):
        self.students.append(student)
        print("学生%s添加成功" % student.name)
    def delete_student(self,del_name):
        for student in self.students:
            if del_name == student.name:
                self.students.remove(student)
                print("%s删除成功" % student.name)
    def answer(self):
        for student in self.students:
            student.answer()
    def show(self):
        for student in self.students:
            student.show()

student1 = Student("张三","20","py0001")
student2 = Student("李四","24","py0002")
student3 = Student("王五","23","py0003")
student4 = Student("田田","21","py0004")
student5 = Student("咻咻","22","py0005")
student6 = Student("果果","21","py0006")
class1 = PythonClass("Python1806")
class1.add(student1)
class1.add(student2)
class1.add(student4)

class1.show()

class1.delete("咻咻")

class1.show()

class Math:
    pi = 3.141159265358
    e = 2.7182818284
    @staticmethod
    def sum_double(self,num1,num2):
        return num1 + num2
    @classmethod
    def circle_area(cls,r):
        return cls.pi *r**2