day-13 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,memory):
        self.brand=brand
        self.color=color
        self.memory=memory

    def play_game(self):
        return '打游戏'

    def write_code(self):
        return '写代码'
    def see_video(self):
        return '看视屏'

computer1=Computer('联想','红色','8_+128g')
computer2=Computer('三星','黑色','8+128g')

print(computer1.play_game())
print(computer1.write_code())
print(computer1.see_video())
获取属性

print(computer1.brand,computer1.color,computer1.memory)#联想 红色 8_+128g
修改属性
computer1.brand='华硕'
computer1.color='白色'
computer1.memory='4+86g'
print(computer1.brand,computer1.color,computer1.memory)#华硕 白色 4+86g

添加属性
computer1.system='win10'
print(computer1.brand,computer1.color,computer1.memory,computer1.system)#华硕 白色 4+86g win10
删除属性
del computer1.system
print(computer1.system)  AttributeError: 'Computer' object has no attribute 'system'

attr方式查增删改
获取
print(getattr(computer2,'brand'))#三星
print(getattr(computer2,'color'))#黑色
print(getattr(computer2,'memory'))#8+128g
print(getattr(computer2,'system','win8')) #没有system属性，返回默认值win8
增改
setattr(computer2,'brand','apple')
setattr(computer2,'color','白色')
setattr(computer2,'memory','8+256g')
setattr(computer2,'system','不知道苹果操作系统')
setattr(computer2,'price','12888rmb') #没有price属性，添加price属性
print(computer2.brand,computer2.color,computer2.memory,computer2.system,computer2.price)
apple 白色 8+256g 不知道苹果操作系统 12888rmb
删除
delattr(computer2,'system')
print(computer2.system)  #AttributeError: 'Computer' object has no attribute 'system'

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，然后让⼩小明去遛⼤大⻩黄

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

    def dog_bark(self):
        return '汪汪汪'
dog1=Dog('李福贵','黄色','2')
print(dog1.dog_bark())

class Person:
    def __init__(self,name1,age,pet=''):
        self.name=name1
        self.age=age
        self.pet=dog1.name

    def walk_the_dog(self):
        return '%s在公园遛%s'%(person1.name,person1.pet)
person1=Person('小钢炮','22')
print(person1.walk_the_dog())

3.声明⼀一个圆类:

class Circle:
    def __init__(self,radius):
        self.radius=radius

    def area(self):
        return 3.14*self.radius**2
    def peri(self):
        return 2*3.14*self.radius
circle1=Circle(3)
print(circle1.area())
print(circle1.peri())

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(object):
      def __init__(self,name,age,study_id):
          self.name=name
          self.age=age
          self.study_id=study_id
      def replay(self):
            print('%s,到'%self.name)
      def show_info(self):
            print(self.name,self.age,self.tudy_id)

class Class():
        def __init__(self,name:str):
              self.name=name
              self.students=[ ]
              self.__creat_id= self.name+str(x).rjust(3,'0') for x in range(1,101)
        def add_student(self):
              name=input('姓名')
              age=int(input('年龄'))
              study_id=next(self.__creat_id)
              stu1=Student(name,age,study_id)
              self.students.append(stu1)