Day_15-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, memory):
        self.brand = brand
        self.color = color
        self.memory = memory

    def play_game(self):
        print('%s可以打游戏' % self.brand)

    def write_code(self):
        print('%s可以愉快的敲代码' % self.brand)

    def watch_video(self):
        print('%s可以快乐的看视频' % self.brand)


computer1 = Computer('戴尔', '蓝色', '8')
# 获取
print(computer1.brand)  # 戴尔
# 修改
computer1.brand = '华硕'
print(computer1.brand)  # 华硕
# 增加
computer1.read = '坏蛋是怎样炼成的'
print(computer1.read)  # 坏蛋是怎样炼成的
# 删除
del computer1.color
print(computer1.color)  # AttributeError: 'Computer' object has no attribute 'color'

# attr方法
computer2 = Computer('联想', '红色', 16)
# 获取
print(getattr(computer2, 'memory'))  # 16
# 修改
setattr(computer2, 'read', '魔道祖师')
print(computer2.read)  # 魔道祖师
# 增加
setattr(computer2, 'hard_disk', '1T')
print(computer2.hard_disk)  # 1T
# 删除
delattr(computer2, 'memory')
print(computer2.memory)  # AttributeError: 'Computer' object has no attribute 'memory'

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

    def bark(self):
        print('听，%s在汪汪叫' % self.name)


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

    def walk_the_dog(self):
        if self.dog:
            print('%s上街溜%s' % (self.name, self.dog.name))
        else:
            print('没有狗，溜自己！')


p1 = Person('小明', 18)
p1.dog = Dog('大黄', '黄色', 3)
p1.walk_the_dog()

3.声明一个圆类:

class P_valueerror(Exception):
    def __str__(self):
        return '当前属性不能赋值'


class Circle:
    pi = 3.14

    def __init__(self, radius, x=0, y=0):
        self.radius = radius
        self.x = x
        self.y = y
        self._area = 0
        self._perimeter = 0

    @property
    def area(self):
        return Circle.pi * self.radius ** 2

    @area.setter
    def area(self, value):
        raise P_valueerror()  # 用另一类创建对象
    
    def perimeter(self):
        return '圆的周长为%.2f' % (Circle.pi * self.radius * 2)


c1 = Circle(3)
print(c1.area)
# c1.area = 6

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, 求班上学生的平均年龄

class Student:
    #创建一个学生类
    def __init__(self, name, age, id1):
        self.name = name
        self.age = age
        self.id1 = id1

    def answer_to(self, *args):
        if args:
            print('%s到' % self.name)
        else:
            print('%s没到' % self.name)

    def show_student_info(self):
        print(self)

    def __repr__(self):
        return str(self.__dict__)[1:-1]


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

    def add_student(self, student):
        self.students.append(student.__dict__)

    def del_student(self, student):
        stu1 = student.__dict__['id1']
        count = 0
        for dict1 in self.students[:]:
            if stu1 == dict1['id1']:
                self.students.remove(dict1)
                print(self.students)
                count += 1

        if count == 0:
            print('没有该学生')

    def call_names(self, student):
        pass

    def students_average_scores(self):
        sum1 = 0
        for dict1 in self.students:
            sum1 += dict1['age']
        print('班级的平均年龄为%.f' % (sum1/len(self.students)))

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

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

    def show_info(self):
        print('学号:%s 姓名:%s 年龄:%d' % (self.study_id, self.name, self.age))

    def add_to_file(self):
        """将对象保存到本地"""
        file_name = self.__class__.__name__+'.json'
        with open('files/'+file_name, 'w', encoding='utf-8') as f:
            json.dump(self.__dict__, f)

    @classmethod
    def get_student_in_file(cls):
        """将字典读出来抓换成对象"""
        file_name = cls.__name__+'.json'
        with open('files/'+file_name, encoding='utf-8') as f:
            dict1 = json.load(f)
            # 将字典转换成对象
            stu = cls()
            for key in dict1:
                setattr(stu, key, dict1[key])
            return stu


print('/=====验证=====')
stu1 = Student('小明', 18, '001')
stu1.add_to_file()

stu2 = Student.get_student_in_file()
print(stu2, stu2.name, stu2.age, stu2.study_id)

print('=====验证=====/')


class Class:

    def __init__(self, name, students: list = []):
        self.name = name
        self.students = students
        # 学号生成器
        self.__id_generation = ('stu'+str(num).rjust(3, '0') for num in range(100))

    def add_student(self):
        """添加学生"""
        # 1.输入信息
        name = input('姓名:')
        age = int(input('年龄:'))
        # 2.生成学号
        study_id = next(self.__id_generation)
        # 3.创建学生对象
        stu = Student(name, age)
        stu.study_id = study_id
        # 4.保存到班级中
        self.students.append(stu)

    def del_student_with_name(self, name):
        """按姓名删除学生"""
        count = 0
        for stu in self.students[:]:
            if stu.name == name:
                count += 1
                stu.show_info()
                value = input('是否删除(Y/N):')
                if value == 'Y' or value == 'y':
                    self.students.remove(stu)
        if count == 0:
            print('没有该学生!s')

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

    def get_mean_age(self):
        """求平均年龄"""
        sum1 = 0
        for stu in self.students:
            sum1 += stu.age
        return sum1/len(self.students)