装饰器

def proxy(func):
    def around():
        print("@Before")
        func()
        print("@After")
    return around

def func():
    print("func")

proxy(func)()

def proxy(func):
    def around():
        print("@Before")
        func()
        print("@After")
    return around

@proxy
def func():
    print("func")

func()