面向对象_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='hp', color='black', card='1t'):
        self.brand = brand
        self.color = color
        self.card = card
    def function(self):
        print('功能：打游戏、写代码、看视频')
hp1 = Computer()
hp1.function()
print(hp1.color)
print(getattr(hp1, 'color'))
hp1.card = '200G'
setattr(hp1, 'card', '200G')
hp1.thickness = '10mm'
setattr(hp1, 'thinkness', '10mm')
del hp1.brand
delattr(hp1, '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, name, color, age):
        self.name = name
        self.color = color
        self.age = age
    def call_out(self):
        print('%s:汪汪汪' % self.name)
d1 = Dog('小黑', '黑色', '2')
d1.call_out()
class Person:
    def __init__(self, name, dog, age=18):
        self.name = name
        self.age = age
        self.dog =dog
    def walk_dog(self):
        print('%s遛%s' % (self.name, self.dog))
p1 = Person('小明', '大黄')
p1.walk_dog()

3.声明⼀一个圆类，自己确定有哪些属性和方法

import math
class Circle:
    def __init__(self, r=2):
        self.r = r
    def perimeter(self):
        print('周长：%s' % (math.pi * 2 * self.r))
    def area(self):
        print('面积：%s' % (math.pi * self.r ** 2))
c1 = Circle(3)
c1.perimeter()
c1.area()

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

with open('class-1904', 'r', encoding='utf-8') as f:
    class_students = eval(f.read())
class Student:
    def __init__(self, name, age, number):
        self.name = name
        self.age = age
        self.number = number
    def sign_in(self):
        print('姓名：%s，年龄：%s，学号：%s:' % (self.name, self.age, self.number), '签到')

s1 = Student('小明', '18', '1904004')
s2 = Student('小李', '21', '1904024')
s3 = Student('小刘', '19', '1904011')
class Class:
    def __init__(self, class_name, *student):
        self.class_name = class_name
        self.student_name = student
    def student_add(self):
        s0 = Student(input('姓名：'), input('年龄：'), input('学号：'))
        self.student = s0
        class_students[s0.name] = '[s0.age, s0.number]'
        # print(eval(class_students['小明'])[0])
        with open('class-1904', 'w', encoding='utf-8') as f:
            f.write(str(class_students))
    def student_del(self):
        sx = input('姓名：')
        del class_students[sx]
        with open('class-1904', 'w', encoding='utf-8') as f:
            f.write(str(class_students))
c1 = Class('py1904')
c1.student_add()
# c1.student_del()
print('班级：%s, 姓名：%s, 年龄：%s, 学号：%s' % (c1.class_name, c1.student.name, c1.student.age, c1.student.number)