装饰函数

1、函数即变量2、高阶函数

  a、把一个函数名当做实参创给另一个函数；

import time
def bar():
    print('in the bar')

def test(func):
    start_tmie=time.time()
    func()
    stop_time=time.time()
    print('the func run time is %s'%(stop_time-start_tmie))
test(bar)

 

1

import time

2

def bar():

3

    print('in the bar')

4

5

def test(func):

6

    start_tmie=time.time()

7

    func()

8

    stop_time=time.time()

9

    print('the func run time is %s'%(stop_time-start_tmie))

10

test(bar)

  b、返回值包含函数名，不用修改函数的调用方式

import time
def bar():
    time.sleep(3)
    print("in the bar")
def test2(func):
    print(func)
    return func
bar=test2(bar)
bar()

 

1

import time

2

def bar():

3

    time.sleep(3)

4

    print("in the bar")

5

def test2(func):

6

    print(func)

7

    return func

8

bar=test2(bar)

9

bar()

函数嵌套

def test01():
    print('in the test01')
    def test02():
        print('in the test02')
    test02()
test01()
######打印结果#####
in the test01
in the test02

 

1

def test01():

2

    print('in the test01')

3

    def test02():

4

        print('in the test02')

5

    test02()

6

test01()

7

######打印结果#####

8

in the test01

9

in the test02

全局作用域和局部作用域

3、装饰函数

高阶函数+嵌套函数=装饰函数

# Aduthor:CCIP-Ma
import time
def timer(func):
    def deco():
        start_time=time.time()
        func()
        stop_time=time.time()
        print('the time %s'%(stop_time-start_time))
    return deco   #返回门牌号，内存地址
@timer   #test1=timer(test1)  意思一样
def test1():
    time.sleep(3)
    print('in the test1')
test1()

 

1

# Aduthor:CCIP-Ma

2

import time

3

def timer(func):

4

    def deco():

5

        start_time=time.time()

6

        func()

7

        stop_time=time.time()

8

        print('the time %s'%(stop_time-start_time))

9

    return deco   #返回门牌号，内存地址

10

@timer   #test1=timer(test1)  意思一样

11

def test1():

12

    time.sleep(3)

13

    print('in the test1')

14

test1()

来自为知笔记(Wiz)