2018-10-17 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

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

    def play_game(self):
        print('打游戏')

    def coding(self):
        print('写代码')

    def watch_video(self):
        print('看视频')


cp1 = Computer('联想', '黑色', 4)

print(cp1.brand)
print(getattr(cp1, 'brand', '苹果'))

cp1.price = 5000
setattr(cp1, 'price', 8000)

cp1.color = '黑色'
setattr(cp1, 'color', 5000)

del cp1.ram
delattr(cp1, '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 法:叫唤
人的属性:名字、 年龄、狗
人的方法:遛狗
a.创建人的对象名字叫小明，让他拥有一条狗 ，然后让小明去遛狗

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

    def shout(self):
        print('叫唤')


class Person:
    def __init__(self, name: str, age: int):
        self.name = name
        self.age = age
        self.dog = None

    def took_the_dog(self):
        if self.dog:
            print('%s正牵着%s在散步' % (self.name, self.dog.name))

    def beat(self):
        if not self.dog:
            print('没有狗！')
p1 = Person('小明', 18)
dog = Dog('大黄', '黄色', 3)
p1.dog = dog
p1.took_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 Rect:
    def __init__(self, length, width):
        self.length = length
        self.width = width

    def perimeter(self):
        return (self.length + self.width)*2

    def area(self):
        return self.length * self.width


rect1 = Rect(3, 2)
print(rect1.perimeter(), rect1.area())

rect2 = Rect(4, 5)
print(rect2.perimeter(), rect2.area())

4.创建一个学生类:
属性:姓名，年龄，学号，成绩
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, 获取班级中所有学生的平均值， 获取班级中成绩最好的学生

class Student:
    def __init__(self, name='', age=0, score=0, study_id=''):
        self.name = name
        self.age = age
        self.study_id = study_id
        self.score = score

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

    def show_message(self):
        print(self.__dict__)


import random


class Class:
    creat_id = ('python'+str(x).rjust(3, '0') for x in range(1, 101))

    def __init__(self, name):
        self.students = []
        self.name = name
    def add_student(self):
        name = input('姓名:')
        age = int(input('年龄:'))
        id = next(Class.creat_id)
        score = random.randint(0, 100)
        stu = Student(name, age, score, id)
        self.students.append(stu)
        print('添加成功:')
        stu.show_message()
    def del_student(self):
        del_name = input('姓名:')
        count = len(self.students)   

        for stu in self.students.copy():
            if stu.name == del_name:
                self.students.remove(stu)

        if count == len(self.students):
            print('没有该学生！')

    def call(self):
        for stu in self.students:
            print(stu.name)
            # 学生答到
            stu.replied()

    def average_score(self):
        scores = 0
        for stu in self.students:
            scores += stu.score

        return scores/len(self.students)

    def most_excellent_student(self):
        return max(self.students, key=lambda stu: stu.score)


class1 = Class('python1807')
for _ in range(5):
    class1.add_student()