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python - 无法使用装饰器打印功能的经过时间

问题描述

我创建了一个装饰器，它通过在运行程序时为给定的装饰器提供 0 毫秒的输出来计算函数所用的时间，在调试工具中它显示开始/结束时间已计算但无法打印（结束 - 开始），如图所示在代码和输出中。

我的代码：

import time

def time_cal(func):
    def wrapper(*args, **kwargs):
        start=time.time()
        result = func(*args, **kwargs)
        end= time.time()
        print(func.__name__+ ' took ' + str((end-start)*1000) + ' milli seconds')
        return result
    return wrapper

a = (1,2,3,5,3,4,4)

b= [1,2,46,565,464]

c= {'num1': '1','num2' : '2', 'num3' : '3'}
en=[]

@time_cal
def evevn_num(i):
    for i in b:
        if i%2==0:
           en.append(i)
        else:
            print("none are present")
    return print(en)
@time_cal
def list_num(f,s,t):
    print('number one',f)
    print('number two', s)
    print('number three', t)

kwargs = {"t": "Three", "s": "Two", "fs": "One"}

evevn_num(b)
list_num(1,2,3)

输出：

none are present
none are present
[2, 46, 464]
evevn_num took 0.0 milli seconds
number one 1
number two 2
number three 3
list_num took 0.0 milli seconds

Process finished with exit code 0

请根据代码帮助我解决时间计算

标签： pythontimepython-decorators

解决方案

您的代码按预期工作，这只是完成功能所需的速度.0013666152954102 seconds。

要进行测试，请添加time.sleep(1)到您的装饰器或尝试使用更复杂的功能。

def time_cal(func):
    def wrapper(*args, **kwargs):
        start=time.time()
        time.sleep(1)
        result = func(*args, **kwargs)
        end= time.time()
        print(func.__name__+ ' took ' + str((end-start)*1000) + ' milli seconds')
        return result
    return wrapper

结果：

none are present
none are present
even_num took 1009.1550350189209 milli seconds
number one 1 
number two 2 
number three 3 
list_num took 1000.5834102630615 milli seconds

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