day13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方式获取、修改、添加和删除它的属性

b.通过attr相关⽅方法去获取、修改、添加和删除它的属性

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


    @staticmethod
    def play_game(game='LOL'):
        return '可以玩'+game

    @staticmethod
    def write_code(code='python'):
        return '可以写' + code

    @staticmethod
    def watch_video(video='一人之下'):
        return '可以看' + video


lenovo = Computer('lenovo','black','4G')
print(lenovo.color)
lenovo.color = 'white'
print(lenovo.color)
lenovo.weight = '2KG'
print(lenovo.weight)
del lenovo.weight
print(getattr(lenovo,'weight',None))

print(getattr(lenovo,'color',None))
setattr(lenovo,'color','red')
print(getattr(lenovo,'color',None))
setattr(lenovo,'weight','3KG')
print(getattr(lenovo,'weight',None))
delattr(lenovo,'weight')
print(getattr(lenovo,'weight',None))

2.声明⼀个人的类和狗的类:

狗的属性:名字、颜⾊色、年年龄

狗的⽅方法:叫唤

人的属性:名字、年年龄、狗

人的⽅方法:遛狗

a.创建⼈人的对象⼩小明，让他拥有⼀一条狗⼤大⻩黄，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

    @staticmethod
    def bark():
        return '汪汪汪'


class Person:
    def __init__(self,name,age,dog=None):    #形参类型为对象时，若要设置为空值，默认值写None
        self.name = name
        self.age = age
        self.dog = dog


    def walk_dog(self):
        if self.dog:
            person_name = self.name
            dog_name = self.dog.name
            return '%s在遛%s' % (person_name,dog_name)
        else:
            return '没有狗可以遛'

dog1 = Dog('大黄','yellow',2)
person1 = Person('小明',12,dog1)
print(person1.walk_dog())

3.声明⼀一个圆类，自己确定有哪些属性和方法

from math import pi
class Circle:
    def __init__(self,radius:int):
        self.radius = radius


    def perimeter(self):
        return '周长是%.2f' % (pi*self.radius*2)


    def area(self):
        return '面积是%.2f' % (pi*self.radius**2)


circle1 = Circle(3)
print(circle1.area())
print(circle1.perimeter())

4.创建⼀一个学⽣生类:

属性:姓名，年龄，学号

方法:答到，展示学⽣生信息

创建⼀一个班级类:

属性:学⽣生，班级名

方法:添加学⽣生，删除学生，点名, 求班上学生的平均年龄

class Student:
    def __init__(self,name:str,age:int,number:str):
        self.name = name
        self.age = age
        self.number = number


    def show_info(self):
        return '学生姓名:%s，年龄:%d，学号:%s' % (self.name,self.age,self.number)


class Class:
    def __init__(self, class_name):
        self.class_name = class_name
        self.student_infos = []

    def add_student(self, student):
        self.student_infos.append(student)
        return self.student_infos

    def sub_student(self, student):
        self.student_infos.remove(student)
        return self.student_infos

    def show_names(self):
        names = ''
        for item in self.student_infos:
            names += item.name + ';'
        return names

    def average_age(self):
        sum_age = 0
        count = 0
        for item in self.student_infos:
            sum_age += item.age
            count += 1
        return sum_age / count


student1 = Student('A',14,'0001')
student2 = Student('B',16,'0002')
student3 = Student('C',15,'0003')

class1 = Class('三年二班')
class1.add_student(student1)
class1.add_student(student2)
class1.add_student(student3)
print(class1.average_age())

# a = [student1,student2,student3]
# print(a)                        对象也可以作为列表元素

"""
class2 = Class('三年一班')
class2.add_student(student1)
class2.sub_student(student1)
print(class2.average_age())
"""
=============================================
class Student:
    def __init__(self, name, age=0, num='0001'):
        self.name = name
        self.age = age
        self.num = num
        self.state = randint(0, 1)    # 是否在教室的状态， 0 -> 不在, 1 -> 在

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

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


class Class:
    def __init__(self, name):
        self.students = [
            Student('stu1', 19, '001'),
            Student('stu2', 20, '002'),
            Student('stu3', 23, '003'),
            Student('stu1', 19, '004'),
            Student('stu4', 30, '005'),
        ]
        self.name = name
        # 学号生成器
        self.__nums = ('stu'+str(num).zfill(3) for num in range(50))

    # 添加学⽣生
    def add_student(self):
        # 输入学生信息
        stu_name = input('姓名:')
        stu_age = int(input('年龄:'))
        stu_num = next(self.__nums)
        # 创建学生对象
        stu = Student(stu_name, stu_age, stu_num)
        # 将学生添加到班级中
        self.students.append(stu)

    # 删除学生
    def del_student(self):
        del_name = input('删除学生的姓名:')
        for stu in self.students[:]:
            if stu.name == del_name:
                self.students.remove(stu)

    # 点名
    def call_the_roll(self):
        for stu in self.students:
            # 喊名字
            print(stu.name)
            # 如果在教室
            if stu.state:
                # 答到
                stu.amount()
            else:
                print('....')

    def average_age(self):
        sum1 = 0
        for stu in self.students:
            sum1 += stu.age
        average = sum1//len(self.students)
        print('平均年龄: %d' % average)
        return average

    def cl_show(self):
        for stu in self.students:
            stu.show()


class1 = Class('py1901')

print('=========添加学生===========')
# for _ in range(5):
class1.add_student()
class1.cl_show()
print('=========删除学生===========')
class1.del_student()
class1.cl_show()
print('=========点名===========')
class1.call_the_roll()
class1.average_age()