以裝飾一個(gè)函數(shù)為例子， 打印出函數(shù)的開(kāi)始執(zhí)行時(shí)間。

常規(guī)方式實(shí)現(xiàn)：

import time


def printTime(func):
    def wrapper(*args, **kwargs):
        print(time.ctime())
        return func(*args, **kwargs)

    return wrapper


def printHello(name):
    print('Hello', name)


if __name__ == '__main__':
    printhello_plus = printTime(printHello)
    printhello_plus('Sam')

輸出：

Tue Nov 27 17:12:10 2018
Hello Sam

裝飾器方式實(shí)現(xiàn)：

import time


def printTime(func):
    def wrapper(*args, **kwargs):
        print(time.ctime())
        return func(*args, **kwargs)

    return wrapper


@printTime
def printhello(name):
    print('Hello', name)


if __name__ == '__main__':
    printhello('Sam')

輸出：

Tue Nov 27 17:21:13 2018
Hello Sam