python-装饰器案例1

python-装饰器案例1

高阶函数+嵌套函数=装饰器

例1：

import time
def timer(func):
    def deco():
        start_time=time.time()
        func()
        stop_time=time.time()
        print("kezi the %s"%(stop_time-start_time))
    return deco
@timer
def test1():
    time.sleep(3)
    print ("in the test1")
@timer
def test2():
    time.sleep(3)
    print("in the test2")

#test1=timer(test1)=@timer
test1()

#test2=timer(test2)=@timer
test2()


打印结果
in the test1
kezi the 3.0000288486480713
in the test2
kezi the 3.0009706020355225

 

例2  代参数的装饰

import time
def timer(func):
    def deco(*arg1,**age2):
        start_time=time.time()
        func(*arg1,**age2)
        stop_time=time.time()
        print("kezi the %s"%(stop_time-start_time))
    return deco
@timer
def test1():
    time.sleep(3)
    print ("in the test1")
@timer
def test2():
    time.sleep(3)
    print("in the test2")
@timer
def test3(name,age):
    time.sleep(3)
    print("in the test3:",name,age)

# #test1=timer(test1)=@timer
test1()
#
# #test2=timer(test2)=@timer
test2()
test3("kezi",33)

打印结果
in the test1
kezi the 3.00183367729187
in the test2
kezi the 3.0006985664367676
in the test3: kezi 33
kezi the 3.000452756881714