python的裝飾器應(yīng)用極其廣泛，在python--學(xué)習(xí)的章節(jié)有所描述，在這里寫兩個(gè)常用的裝飾器。

測(cè)試程序運(yùn)行次數(shù)的裝飾器

def run_times_outt(func):
    count = 0
    def run_times_inn(*args,**kwargs):
        nonlocal count
        count += 1
        func(*args,**kwargs)
        print('函數(shù)func運(yùn)行次數(shù)為：{}'.format(count))
    return run_times_inn

@run_times_outt
def test_func():
    print('函數(shù)運(yùn)行了?。?！')

for i in range(10):
    test_func()

運(yùn)行結(jié)果：
函數(shù)運(yùn)行了?。?！
函數(shù)func運(yùn)行次數(shù)為：1
函數(shù)運(yùn)行了?。。?函數(shù)func運(yùn)行次數(shù)為：2
函數(shù)運(yùn)行了?。?！
函數(shù)func運(yùn)行次數(shù)為：3
函數(shù)運(yùn)行了?。。?函數(shù)func運(yùn)行次數(shù)為：4
函數(shù)運(yùn)行了！！！
函數(shù)func運(yùn)行次數(shù)為：5
函數(shù)運(yùn)行了！?。?函數(shù)func運(yùn)行次數(shù)為：6
函數(shù)運(yùn)行了?。?！
函數(shù)func運(yùn)行次數(shù)為：7
函數(shù)運(yùn)行了！??！
函數(shù)func運(yùn)行次數(shù)為：8
函數(shù)運(yùn)行了?。。?函數(shù)func運(yùn)行次數(shù)為：9
函數(shù)運(yùn)行了！！！
函數(shù)func運(yùn)行次數(shù)為：10

測(cè)試函數(shù)運(yùn)行時(shí)間的裝飾器

import time
def run_out_time(func):
    def run_in_time(*args,**kwargs):
        t0 = time.time()
        func(*args,**kwargs)
        t1 = time.time()
        print('函數(shù)運(yùn)行時(shí)間為{}'.format(t1 - t0))
    return run_in_time  
 
@run_out_time
def type_test():
    print('-------------type函數(shù)運(yùn)行時(shí)間----------------------')
    for i in range(10000):
        type('人生苦短，我用python')

type_test()

運(yùn)行結(jié)果：
-------------type函數(shù)運(yùn)行時(shí)間----------------------
函數(shù)運(yùn)行時(shí)間為0.0009984970092773438

這兩個(gè)裝飾器在程序測(cè)試中會(huì)經(jīng)常用到。也可以聯(lián)合使用。

import time
def run_times_outt(func):
    count = 0
    def run_times_inn(*args,**kwargs):
        nonlocal count
        count += 1
        func(*args,**kwargs)
        print('函數(shù){}運(yùn)行次數(shù)為：{}'.format(func,count))
    return run_times_inn
def run_time_outt(func):
    def run_time_inn(*args,**kwargs):
        t = time.time()
        func(*args,**kwargs)
        print('程序運(yùn)行時(shí)間為：{}'.format(time.time() - t))
    return run_time_inn

@run_times_outt
@run_time_outt
def test_func():
    for i in range(1000000):
        type(i)
    print('函數(shù)運(yùn)行了！??！')

for i in range(10):
    test_func()
輸出：
函數(shù)運(yùn)行了?。?！
程序運(yùn)行時(shí)間為：0.10501623153686523
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：1
函數(shù)運(yùn)行了?。?！
程序運(yùn)行時(shí)間為：0.13301825523376465
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：2
函數(shù)運(yùn)行了！?。?程序運(yùn)行時(shí)間為：0.12669014930725098
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：3
函數(shù)運(yùn)行了?。。?程序運(yùn)行時(shí)間為：0.11151671409606934
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：4
函數(shù)運(yùn)行了?。。?程序運(yùn)行時(shí)間為：0.10951447486877441
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：5
函數(shù)運(yùn)行了?。?！
程序運(yùn)行時(shí)間為：0.1155393123626709
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：6
函數(shù)運(yùn)行了！?。?程序運(yùn)行時(shí)間為：0.11101078987121582
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：7
函數(shù)運(yùn)行了?。?！
程序運(yùn)行時(shí)間為：0.10601115226745605
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：8
函數(shù)運(yùn)行了?。?！
程序運(yùn)行時(shí)間為：0.10701227188110352
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：9
函數(shù)運(yùn)行了！??！
程序運(yùn)行時(shí)間為：0.10759115219116211
函數(shù)<function run_time_outt.<locals>.run_time_inn at 0x00000235963F7730>運(yùn)行次數(shù)為：10