Python3.5装饰器典型案例分析
本文实例讲述了Python3.5装饰器。分享给大家供大家参考，具体如下：
#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:ZhengzhengLiu
#高阶函数+嵌套函数==>装饰器
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() #-->执行decor
test2()
运行结果：
<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、装饰器修饰有参数函数
#高阶函数+嵌套函数==>装饰器
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)
运行结果 :
test2: liu 23
the run time of func is 0.0
2、装饰器修饰多个函数，有的函数带参数，有的函数不带参数的情况（采用参数组）
#高阶函数+嵌套函数==>装饰器
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() #-->执行decor
test2("liu",23)
运行结果：
in the test1
the run time of func is 3.0036065578460693
test2: liu 23
the run time of func is 1.0084023475646973
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