-- coding: utf-8 --

"""

File Name： day12作业
Author : LPP
E-mail : l.piaopiao@qq.com
date： 2018/7/31

---

Change Activity:
2018/7/31:

---

"""

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='DELL', color='black', memory='4Gb DDR4 2133MHz'):
        self.brand = brand
        self.color = color
        self.memory = memory

    def play_games(self):
        print('%s玩扫雷一点都不卡'% self.brand)

    def writing_codes(self):
        print('%s写代码必备良品'% self.brand)

    def watch_videos(self):
        print('%s看西游记后传是真的卡')

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
b.通过attr相关方法去获取、修改、添加和删除它的属性

computer = Computer('小米', '黑色')
print('computer.brand:',computer.brand)
print('getattr(computer', getattr(computer, 'brand'))

computer.brand = '宏碁'
setattr(computer, 'brand', '华硕')
print('computer.brand:',computer.brand)
print('getattr(computer, \'brand\')', getattr(computer, 'brand'))

computer.GPU = '1050Ti'
setattr(computer, 'CPU', 'i5-7300HQ')
print('computer.GPU:',computer.GPU)
print('getattr(computer, \'CPU\')', getattr(computer, 'CPU'))

del computer.memory
delattr(computer, '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
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=0, pet=None):
        self.name = name
        self.age = age
        self.pet = pet

    def walk_the_dog(self):
        print('%s溜他的狗 -- %s' % (self.name, self.pet.name))


class Dog:
    def __init__(self, name='', age=0, color='黑'):
        self.name = name
        self.age = age
        self.color = color

    def bark(self):
        print('嗷~ 呜~~')


dog1 = Dog('大黄', 3)
p1 = Person('小明', 18, dog1)

p1.walk_the_dog()

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 Rectangle:
    def __init__(self, width=0, height=0):
        self.width = width
        self.height = height

    def perimeter(self):
        print('周长: %.2f' % (2*(self.width+self.height)))

    def area(self):
        print('面积: %.2f' % (self.width*self.height))


r1 = Rectangle(6, 8)
r1.perimeter()
r1.area()

r2 = Rectangle(4, 6)
r2.perimeter()
r2.area()

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=0, id='py1805001'):
        self.name = name
        self.age = age
        self.id = id

    def sign_in(self):
        print('到!')

    def show_info(self):
        print('姓名:', self.name)
        print('年龄:', self.age)
        print('学号:', self.id)


class Class:
    def __init__(self, name='py1805', students=[]):
        self.name = name
        self.students = students

    def add_stu(self,student):
        self.students.append(student)

    def del_stu(self, id):
        for stu in self.students:
            if id == stu.id:
                del stu

    def call_the_roll(self):
        for stu in self.students:
            print(stu.name)

5.写一个类，封装所有和数学运算相关的功能（包含常用功能和常用值，例如：pi,e等）

class Calculation:
    pi = 3.1416926
    e = 2.718
    # def __init__(self, a=0, b=0):
    #     self.a = a
    #     self.b = b
    #

    def plus(self, a, b):
        return a+b

    def multi(self, a, b):
        return a*b

    def divide(self, a, b):
        if b:
            return '除数不能为0'
        else:
            return a/b

    def reduce(self, a, b):
        return a-b

6.1.写一个班级类，属性：班级名、学生；功能：添加学生、删除学生、根据姓名查看学生信息，展示班级的所有学生信息

class Class:
    def __init__(self, name='py1805', students=[]):
        self.name = name
        self.students = students

    def add_stu(self,student):
        self.students.append(student)

    def del_stu(self, id):
        for stu in self.students:
            if id == stu.id:
                self.students.remove(stu)
                
    def find_stu(self,name):
        for stu in self.students:
            if stu.name == name:
                print('姓名    学号    年龄\n',stu.name, stu.id, stu.age, sep='  ')
                
    def show_all(self):
        for stu in self.students:
            print('姓名    学号    年龄\n', stu.name, stu.id, stu.age, sep='  ')