类和面向对象

# python 类支持封装、继承、多态
# 类名称首字符大写。建议遵循驼峰语法

# 第一行代码,定义一个空类
class FirstClass(object):
    pass

# 类变量和 类方法
class SecondClass(object):
    name='张三'
    age=30
    def introlduction(self):
        print("大家好，我叫{},今年{}岁".format(self.name,self.age))

# 构造方法
class ThirdClass(object):
    def __init__(self,name,age) -> None:
        self.name=name
        self.age=age
    def introduction(self):
        print("大家好，我叫{},今年{}岁".format(self.name,self.age))
        
T=ThirdClass('张三',30)
T.age=31
T.introduction()

定义一个基类

class Persion(object):
    def __init__(self, name):
        self.name=name
    def aa(fn):
        def new(*args,**kwargs):
            print('这一行用于判断')
            fn(*args,**kwargs)
            print('这一行是日志')
        return new
    @aa
    def say(self,address):
        print(self.name,address)

派生子类

class BlackPersion(Persion):
    def __init__(self, name):
        super().__init__(name)
    @Persion.aa
    def newfn(self):
        print(self.name)

b=BlackPersion('zhansan')
b.say('fz')
b.newfn()