裝飾器 Decorators 用來給對(duì)象動(dòng)態(tài)添加一些新的行為.閉包也是這樣.

>>> def my_decorator(func):
        def wrapper(*args, **kwargs):
            print("Before call")
            result = func(*args, **kwargs)
            print("After call")
            return result
        return wrapper

>>> @my_decorator
    def add(a, b):
        return a + b

>>> add(1, 3)
Before call
After call
4