Python 装饰器代码解析

def demo(func_test):
    def wrapper():
        print('定义的第一个装饰器')
        func_test()
        print('装饰器结束')
    return wrapper    #这里注意不要加括号


@demo
def func_test():
    print('小白小白！！！！')

def demo(func_test):
    def wrapper(name):
        print('定义的第一个装饰器')
        func_test(name)
        print('哦，你就是%s啊'%name)
        print('装饰器结束')
    return wrapper


@demo
def func_test(name):
    print('大家好我叫%s'%name)

def demo(func_test):
    def wrapper(*name,**kwargs):
        print('定义的第一个装饰器')
        func_test(*name,**kwargs)
        print('哦，你就是%s啊'%name[0])
        print('你今年%s岁啊'%name[1])
        print('装饰器结束')
    return wrapper


@demo
def func_test(name,age):
    print('大家好我叫%s'%name)
    print('今年{}'.format(age))

def deco01(func):
    def wrapper(*args,**kwargs):
        print('第一层的装饰器')
        func(*args,**kwargs)
        print('第一层装饰器结束')
    return wrapper


def deco02(func):
    def wrapper(*args,**kwargs):
        print('这是第二层装饰器')
        print('第二层装饰器结束')
        func(*args, **kwargs)
    return wrapper


@deco02
@deco01
def func(a,b,c,name):
    print('hello ,here is a func')
    print("result is %d" %(a+b+c))
    print('name:{}'.format(name))

class Mydecorator():
    def __init__(self,func):
    # 定义为私有属性
        self.func = func
    # 实现__call__方法，让对象变成可以调用的对象，可调用的对象可以想函数那样使用
    def __call__(self, *args, **kwargs):   
        print('测试类装饰器')
        self.func(*args)
        catalogue = args[0]
        suffix = catalogue.split('.')[2]
        try:
            if suffix == 'json':
                with open(*args,'r',encoding='utf-8') as file_object:
                    contents = json.load(file_object)
                    print(contents)
            else:
                with open(*args,'r',encoding='utf-8') as file_object:
                    contents = file_object.read()
                    print(contents)
        except Exception as a:
            print('读取文件出错拉：{}'.format(a))
@Mydecorator
def name(name):
    print('请输入对应文件路径：%s'%name)