2019 April 26 Python

Python Decorator

Ref: Python 装饰器为什么难理解？https://zhuanlan.zhihu.com/p/27449649

Background

Everything is an object in Python, so does a function
A function can be used as an argument passing into another function
A function can be used as a return value as well

A simple example

def wrap(aFunc):
    def wrapped():
        print("Starting ...")
        aFunc()  # closure
        print("End")
    return wrapped

def foo():
    print("foo")

foo = wrap(foo)  # wrap / decorate 
foo()


# Using decorator
@wrap
def foo():
    print("foo")

foo()

This is decorator

[DONE]