2019-01-11 day15作业

import wm_file_manager

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

print('=========第一题==========')
class Computer:
    def __init__(self, brand, color, memory):
        self.brand = brand
        self.color = color
        self.memory = memory

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

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

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


print('=======通过对象点的方式获取、修改、添加和删除它的属性=====')
c1 = Computer('dell', 'blue', '256G')
c1.game()
c1.watch_video()
c1.write_code()

brand = c1.brand
color = c1.color
memory = c1.memory
# 修改
c1.color = 'red'
# 增加
c1.size = '12英寸'
size = c1.size
print('电脑属性：%s, %s, %s, %s' % (brand, color, memory, size))
# 删除
del c1.brand
print(c1.color, c1.memory, c1.size)

print('=======通过attr相关方法去获取、修改、添加和删除它的属性=====')
c2 = Computer('dell', 'blue', '256G')
# 获取对象属性
brand = getattr(c2, 'brand', None)
color = getattr(c2, 'color')
print(brand, color)
# 修改和增加
setattr(c2, 'color', 'red')
setattr(c2, 'size', '12英寸')
print(getattr(c2, 'color'), getattr(c2, 'size'))
# 删除
delattr(c2, 'brand')

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

print('=========第二题==========')
class Human:
    def __init__(self, name='', age=0, dog=''):
        self.name = name
        self.age = age
        self.dog = dog

    def walk_the_dog(self):
        dog1 = Dog(self.dog, '黄色', 2)
        print('%s去遛%s了' % (self.name, self.dog))
        dog1.cry()


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

    def cry(self):
        print('%s兴奋地一直叫唤！' % self.name)


human1 = Human('小明', 18, '大黄')
human1.walk_the_dog()

3.声明一个圆类:

print('=========第三题==========')
class Circle:
    def __init__(self, radius=1):
        self.radius = radius

    def circle(self):
        print('我是一个半径是%.1f的圆' % self.radius)


circle1 = Circle(3)
circle1.circle()

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

print('=========第四题==========')
def show_message(dict1: dict):
    return 'name: %s, age: %d, id: %s' % (dict1['name'], dict1['age'], dict1['id'])


class Student:
    def __init__(self, class_object):
        self.class_objcet = class_object

    def check_in(self):
        self.class_objcet.check_in()

    def show_stu_message(self):
        self.class_objcet.show_stu_msg()


class Class:
    def __init__(self, class_name=''):
        self.class_name = class_name
        all_students = wm_file_manager.read_json_file('all_students.json')
        if not all_students:
            all_students = {}
        if not all_students.get('students', None):
            all_students['students'] = []
        students = all_students['students']
        self.students = students

    def add_student(self):
        all_students = wm_file_manager.read_json_file('all_students.json')
        if not all_students:
            all_students = {}
        count = all_students.get('count', 0)
        count += 1

        name = input('输入姓名：')
        age = int(input('输入年龄：'))
        id = 'stu' + str(count).rjust(3, '0')
        stu2 = {'name': name, 'age': age, 'id': id}
        self.students.append(stu2)

        all_students['students'] = self.students
        all_students['count'] = count
        wm_file_manager.write_json_file(all_students, 'all_students.json')
        print('添加成功！')

    def del_student(self):
        all_students = wm_file_manager.read_json_file('all_students.json')
        if not all_students:
            print('暂无学生信息！请先添加学生！')
            return
        if not all_students.get('students', None):
            print('暂无学生信息！请先添加学生！')
            return

        students = all_students['students']
        print(students)
        name = input('请输入要删除学生的姓名：')
        del_students = []
        for stu in students:
            if name == stu['name']:
                del_students.append(stu)

        if not del_students:
            print('没有该学生！')
            return

        index = 0
        for stu in del_students:
            print(str(index) + '  ' + show_message(stu))
            index += 1
        print('1.继续')
        print('2.按任意键退出')
        choice = input('请选择：')
        if choice != '1':
            return

        index = int(input('选择要删除学生的序号：'))
        if index > len(del_students) - 1:
            print('没有这个序号！重来吧！')
            return
        del_stu = del_students[index]
        students.remove(del_stu)

        print(students)

        all_students['students'] = students

        print(all_students)

        result = wm_file_manager.write_json_file(all_students, 'all_students.json')
        if result:
            print('删除成功！')
        else:
            print('删除失败！')

    def show_stu_msg(self):
        all_students = wm_file_manager.read_json_file('all_students.json')
        students = all_students['students']
        for stu in students:
            print(show_message(stu))

    def check_in(self):
        all_students = wm_file_manager.read_json_file('all_students.json')
        students = all_students['students']
        name = input('点名：')
        # 这里应该再创建一个文件保存进班的人。
        # 如果点的名字本来在班级就不存在，那么提示该人不存在
        # 如果点的名字就是班里的同学，那么再来判断这个人在不在
        for stu in students:
            if name == stu['name']:
                print('%s到！' % name)
                break
        else:
            print('%s不在！' % name)

    def average_age(self):
        all_students = wm_file_manager.read_json_file('all_students.json')
        students = all_students['students']
        age = 0
        for stu in students:
            age += stu['age']
        average_age = int(age/len(students))
        return average_age


class1 = Class('1班')
# 增删学生信息
# class1.add_student()
# class1.del_student()

# 查看学生信息
stu1 = Student(class1)
stu1.show_stu_message()

# 点名答到
# class1.check_in()
# stu1.check_in()

# 求班上学生的平均年龄
print(class1.average_age())