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Python3.5裝飾器典型案例分析

發(fā)布時間:2020-10-08 04:16:37 來源:腳本之家 閱讀:155 作者:loveliuzz 欄目:開發(fā)技術(shù)

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(jié)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(jié)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(jié)果:

in the test1
the run time of func is 3.0036065578460693
test2: liu 23
the run time of func is 1.0084023475646973

更多關(guān)于Python相關(guān)內(nèi)容可查看本站專題:《Python數(shù)據(jù)結(jié)構(gòu)與算法教程》、《Python Socket編程技巧總結(jié)》、《Python函數(shù)使用技巧總結(jié)》、《Python字符串操作技巧匯總》及《Python入門與進階經(jīng)典教程》

希望本文所述對大家Python程序設(shè)計有所幫助。

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