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
class Computer:
def __init__(self, brand='', color='', memory=''):
self.brand = brand
self.color = color
self.memory = memory
@classmethod
def play_game(cls):
print('打游戏')
@classmethod
def write_code(cls):
print('写代码')
@classmethod
def watch_video(cls):
print('看视频')
c1 = Computer()
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
# 获取
print(c1.brand)
# 添加
c1.brand = '华硕'
c1.color = '黑色'
c1.memory = '8G'
# 修改
c1.brand = '苹果'
# 删除
del c1.brand
b.通过attr相关⽅方法去获取、修改、添加和删除它的属性
# 获取
print(getattr(c1, 'brand', '外星人'))
# 添加
setattr(c1, 'brand', '华硕')
setattr(c1, 'brand', '黑色')
setattr(c1, 'brand', '8G')
# 修改
setattr(c1, 'brand', '华硕')
# 删除
delattr(c1, 'color')
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='', age=0, color=''):
self.name = name
self.age = age
self.color = color
@classmethod
def shout(cls):
print('汪汪汪...')
class Person:
def __init__(self, name, age, dog=None):
self.name = name
self.age = age
self.dog = dog
def walk_dog(self):
print('%s在遛%s' % (self.name, self.dog.name))
d1 = Dog('大黄', 3, '黄色')
p1 = Person('小明', 18, d1)
p1.walk_dog()
运行：
image.png
3.声明⼀一个圆类:
class Circle:
def __init__(self, radius):
self.radius = radius
def area(self):
import math
area = (math.pi * self.radius ** 2)
return '面积是%.2f' % area
def peri(self):
import math
peri = 2 * math.pi * self.radius
return '周长是%.2f' % peri
c1 = Circle(5)
print(c1.area(), c1.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
def open_read_files():
with open('Pweson.json') as f:
content = f.read()
return content
def open_write_diles(content):
with open('Person.json', 'w', encoding='utf-8') as f:
f.write(content)
class Student:
def __init__(self, name, age, num):
self.name = name
self.age = age
self.num = num
@classmethod
def answer(cls, name2):
import json
content = json.loads(open_read_files())
for x in content:
if name2 in x['name']:
print('到！')
return x
class Class1:
def __init__(self, *stu, classname):
self.stu = stu
self.classname = classname
@classmethod
def add_stu(cls, s):
import json
content = json.loads(open_read_files())
if not content:
s = s.__dict__
content.append(s)
content = json.dumps(content)
open_write_diles(content)
content = json.loads(open_read_files())
print(content)
print('添加成功！')
else:
for x in content:
if s.num not in x and content.index(x) == -1:
s = s.__dict__
content.append(s)
content = json.dumps(content)
open_write_diles(content)
content = json.loads(open_read_files())
print(content)
print('添加成功！')
else:
print('账号已存在！')
@classmethod
def del_stu(cls, s):
import json
content = json.loads(open_read_files())
if not content:
print('无任何学生信息！')
else:
for x in content:
if s.num1 in x:
content.remove(x)
open_write_diles(content)
print('删除成功！')
else:
print('账号不存在!')
@classmethod
def call_the_roll(cls, name1):
print('%s' % name1)
s = Student()
s.answer(name1)
@classmethod
def average(cls):
import json
content = json.loads(open_read_files())
sum_age = 0
for x in content:
sum_age += x['age']
return '平均年龄是%.2f' % sum_age
