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
class Computer:
"""类的说明文档：声明的电脑类"""
__slots__ = ('brand', 'color', 'memory', 'price', 'screen')
def __init__(self, brand, color, memory):
self.brand = brand
self.color = color
self.memory = memory
def function(self):
print('%s可以打游戏、敲代码、看视频' % self.brand)
# 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
computer1 = Computer('Asus', '黑色', '4Ghz')
print('++++++++++++++获取+++++++++++++++')
print('品牌：', computer1.brand, '颜色：', computer1.color, '内存：', computer1.memory) # 点方法获取电脑属性
print('品牌：', getattr(computer1, 'brand')) # attr 方法获取
print('++++++++++++++修改+++++++++++++++')
computer1.brand = '东芝'
print('品牌：', computer1.brand) # 点方法修改
setattr(computer1, 'brand', '联想') # attr方法修改
print('++++++++++++++添加+++++++++++++++')
computer1.price = 5000 # 点方法添加
setattr(computer1, 'screen', '15.4') # attr 方法添加
print('品牌：', computer1.brand, '颜色：', computer1.color, '内存：', computer1.memory,
'价格：', computer1.price, '屏幕尺寸：', computer1.screen)
print('++++++++++++++删除+++++++++++++++')
del computer1.brand
delattr(computer1, 'color')
print('内存：', computer1.memory, '价格：', computer1.price, '屏幕尺寸：', computer1.screen)
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
class Person:
"""类的说明：定义人类"""
def __init__(self, name, dog, age=0):
self.name = name
self.age = age
self.dog = dog
def playDog(self):
print('%s有一条叫做%s的狗，小明每天带着%s去遛弯' % (self.name, self.dog, self.dog))
class Dog:
"""类的说明：定义狗类"""
def __init__(self, name, color='黑色', age=1):
self.name = name
self.color = color
self.age = age
def bark(self):
print('%s天天叫唤个不停')
dog1 = Dog('大黄')
p1 = Person('小明', dog1.name)
p1.playDog()
3.声明一个圆类，自己确定有哪些属性和方法
class Circle:
"""类的说明：定义一个圆类，并求圆的周长和面积"""
global pi
pi = 3.14
def __init__(self, r):
self.r = r
def perimeter(self):
rerimeter = 2 * pi * self.r
return rerimeter
def area(self):
area = pi * self.r**2
return area
circle1 = Circle(3)
print('圆的面积为%s' % circle1.perimeter())
print('圆的面积为%s' % circle1.area())
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
import random
class Student:
"""类的说明：定义一个学生类"""
def __init__(self, name, age, stuid='001'):
self.name = name
self.age = age
self.stuid = stuid
self.state = random.randint(0, 1)
def answer(self):
if self.state == 0:
print('%s没有到' % self.name)
else:
print('%s 到了' % self.name, '姓名：%s 年龄：%s 学号：%s' % (self.name, self.age, self.stuid))
class Class:
"""
类的说明：定义一个班级类
实现添加学生，删除学生并且求出学生平均年龄的功能
"""
def __init__(self, class_name, *student):
self.class_name = class_name
self.student = list(student)
# for student in self.student:
# print('姓名：%s 年龄：%s 学号：%s' % (student.name, student.age, student.stuid))
def add_student(self, stu):
self.student.append(stu)
# for student in self.student:
# print('姓名：%s 年龄：%s 学号：%s' % (student.name, student.age, student.stuid))
def del_student(self, student):
self.student.remove(student)
# for student in self.student:
# print('姓名：%s 年龄：%s 学号：%s' % (student.name, student.age, student.stuid))
def answer_student(self):
for stu in self.student:
stu.answer()
def avg_age(self):
totals = 0
for stu in self.student:
totals += stu.age
avg_age = totals / len(self.student)
return avg_age
student1 = Student('学生1', 58, '001')
student2 = Student('学生2', 45, '002')
student3 = Student('学生3', 43, '003')
student4 = Student('学生4', 40, '004')
student5 = Student('学生5', 62, '005')
class1 = Class('python1902', student1, student2, student3, student4)
# print(class1.student)
class1.add_student(student5) # 添加学生
# print(class1.student)
class1.del_student(student2) # 删除学生
# print(class1.student)
print('班级学生的平均年龄为：', class1.avg_age()) # 求学生的平均年龄
class1.answer_student() # 学生点到
