Python3.5裝飾器典型案例分析

更新時間：2019年04月30日 10:00:24 作者：loveliuzz

這篇文章主要介紹了Python3.5裝飾器,結合實例形式分析了裝飾器修飾有參數(shù)函數(shù)、裝飾器修飾函數(shù)參數(shù)等情況相關使用技巧,需要的朋友可以參考下

本文實例講述了Python3.5裝飾器。分享給大家供大家參考，具體如下：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:ZhengzhengLiu
#高階函數(shù)+嵌套函數(shù)==>裝飾器
import time
def timer(func):    #timer(test1)-->func=test1
  def decor():
    start_time = time.time()
    func()     #run test1
    stop_time = time.time()
    print("the run time of func is %s" %(stop_time-start_time))
  return decor
@timer   #test1 = timer(test1)
def test1():
  time.sleep(3)
  print("in the test1")
@timer   #test2 = timer(test2)
def test2():
  time.sleep(3)
  print("in the test2")
print(timer(test1))     #打印deco的地址
#test1 = timer(test1)
#test2 = timer(test2)
test1()  #-->執(zhí)行decor
test2()

運行結果：

<function timer.<locals>.decor at 0x00B720C0>
in the test1
the run time of func is 3.000171661376953
in the test2
the run time of func is 3.000171661376953

1、裝飾器修飾有參數(shù)函數(shù)

#高階函數(shù)+嵌套函數(shù)==>裝飾器
import time
def timer(func):    #timer(test1)-->func=test1
  def decor(arg1,arg2):
    start_time = time.time()
    func(arg1,arg2)     #run test2
    stop_time = time.time()
    print("the run time of func is %s" %(stop_time-start_time))
  return decor
@timer   #test2 = timer(test2) = decor  test2(name)==>decor(name)
def test2(name,age):
  print("test2:",name,age)
test2("liu",23)

運行結果 :

test2: liu 23
the run time of func is 0.0

2、裝飾器修飾多個函數(shù)，有的函數(shù)帶參數(shù)，有的函數(shù)不帶參數(shù)的情況（采用參數(shù)組）

#高階函數(shù)+嵌套函數(shù)==>裝飾器
import time
def timer(func):    #timer(test1)-->func=test1
  def decor(*args,**kwargs):
    start_time = time.time()
    func(*args,**kwargs)     #run test1
    stop_time = time.time()
    print("the run time of func is %s" %(stop_time-start_time))
  return decor
@timer   #test1 = timer(test1)
def test1():
  time.sleep(3)
  print("in the test1")
@timer   #test2 = timer(test2) = decor  test2(name)==>decor(name)
def test2(name,age):
  time.sleep(1)
  print("test2:",name,age)
#test1 = timer(test1)
#test2 = timer(test2)
test1()  #-->執(zhí)行decor
test2("liu",23)

運行結果：