day14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 function(self):
        print('打游戏')
        print('写代码')
        print('看视频')

c = Computer('华硕', '白色', '16GB')
c.function()
print(c.brand, c.color, c.memory)
c.brand = '戴尔'
c.color = '黑色'
c.memory = '8GB'
print(c.brand, c.color, c.memory)
del c.color
setattr(c, 'GPU', 'NVIDA')
print(c.GPU)
delattr(c.brand)
print(c.brand)

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,dog_name, color,age):
        self.name = dog_name
        self.color = color
        self.age = age

    def call_out(self):
        print('%s:叫唤' % self.name)


dog1 = Dog('大黄', '黄色', 5)
print(dog1.name, dog1.color, dog1.age)
dog1.call_out()


class Person:
    def __init__(self, name, age, dog):
        self.name = name
        self.age = age
        self.dog = dog

        def walk_dog(self):
        print('%s 遛' % self.name, dog1.name)

p1 = Person('小明', 18, dog1.name)
print(p1.name, p1.age, p1.dog)
p1.walk_dog()

3.声明⼀一个圆类，自己确定有哪些属性和方法

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

    #面积
    def area(self):
        area1 = pi * c.r * c.r
        print(area1)

    #周长
    def perimeter(self):
        per = 2 * pi * c.r
        print(per)

    #直径
    def diameter(self):
        dia = 2 * c.r
        print(dia)

c = Circle(10)
print(c.r)
c.area()
c.perimeter()
c.diameter()

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

#学生类
class Student:
    def __init__(self, name, age, study_id):
        self.name = name
        self.age = age
        self.study_id = study_id

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

    def info(self):
        print(stu1.name, stu1.age, stu1.study_id)

stu1 = Student('小明', 18, '1001')

stu1.answer()
stu1.info()

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 Classes:
    def __init__(self, student, class1):
        self.student = student
        self.class1 = class1

    def add_student(self):
        with open('files/students', 'a', encoding='utf-8') as f:
            f.write(self.student)
            f.write(self.class1)

    def del_student(self):
        with open('files/students', '', encoding='utf-8') as f:
            f.__delattr__(self.student)


Class_stu1 = Classes('张三', 'Class 1')
Class_stu2 = Classes('李四', 'Class 2')

Class_stu1.add_student()
Class_stu2.add_student()

Class_stu1.del_student()