18

我试图在一个while循环中计时一个while循环，执行它所花费的总时间，并记录它每次循环所花费的时间。如果可能的话，我需要一种方法来使用我的代码来实现这一点，或者对我可能还不知道的不同概念持开放态度。

import random
import time
import sys

def main():


    looperCPU = 500
    start = time.time()
    while (looperCPU != 0):
        #start = time.time()

        #this is the computation for 3 secs
        time.sleep(3)
        random_number = random.randint(0,1000)

        #Send to printer for processing
        #.75 secs to 4.75 secs to generate a pause before printing
        secondsPause = random.uniform(.75,4.75)


        #This is the printer function
        printerLooper = True
        while printerLooper == True :
            print("Sleeping for ", secondsPause, " seconds")
            print(random_number)
            printerLooper = False


        #
        print("total time taken this loop: ", time.time() - start)
        looperCPU -= 1    



main()

该循环将打印一个时间，但我很确定它没有考虑嵌套的 while 循环睡眠时间。如何允许 python 对两个 while 循环进行计时，它需要执行的每个循环（在本例中为 500）？

4

4 回答 4

24

当您在初始循环之外设置 start 时，您保证您获得的 while 循环执行时间不正确。这就像说：

program_starts = time.time()
while(True):
    now = time.time()
    print("It has been {0} seconds since the loop started".format(now - program_starts))

这是因为 start 在整个执行时间内保持不变，而您的 end 时间随着时间的推移而稳步增加。通过将开始时间放在循环中，您可以确保您的开始时间也随着程序运行而增加。

while (looperCPU != 0):
    start_time = time.time()
    # Do some stuff
    while printerLooper == True :
        print("Sleeping for ", secondsPause, " seconds")
        print(random_number)
        printerLooper = False
    end_time = time.time()

    print("total time taken this loop: ", end_time - start_time)
于 2013-02-07T01:44:11.757 回答
3

在 python 中，您可以查看此文档https://docs.python.org/2/library/timeit.html
Stackoverflow 示例：如何使用 timeit 模块

import timeit
timeit.timeit('"-".join(str(n) for n in range(100))', number=10000)

在 Jupyter 笔记本中，

%%timeit -n 100
import pandas as pd
s = pd.Series([101.00, 121.00])
summary = 0
for item in s:
    summary+=item
于 2017-02-12T06:16:21.950 回答
1

正确的想法，但是您对计时功能的放置有点偏离，我在这里更正了：

import random
import time import sys

def main():

    looperCPU = 500
    start = time.time()
    while (looperCPU != 0):
       #this is the computation for 3 secs
       time.sleep(3)
       random_number = random.randint(0,1000)

       #Send to printer for processing
       #.75 secs to 4.75 secs to generate a pause before printing
       secondsPause = random.uniform(.75,4.75)


       #This is the printer function
       printerLooper = True
       myStart = time.time()
       while printerLooper == True :
          print("Sleeping for ", secondsPause, " seconds")
          print(random_number)
          printerLooper = False
          print("total time taken this loop: ", time.time() - myStart)    

       looperCPU -= 1    
main()
于 2013-02-07T01:40:50.467 回答
1

你可以使用这个 pytictoc。使用 pip 或 conda 安装。阅读有关pytictoc的文档。它像 matlabs tic toc 一样工作。基本上只是用tic开始计时器并以toc结束。您可以直接打印或将其存储在新变量中。 

from pytictoc import TicToc
def main()
    t = TicToc()  # create instance of class
    start_time= t.tic() #start timer
    while ():  


    #end of while loop

    end_time = t.toc()
    print("end_time", end_time)
于 2018-11-15T13:30:13.727 回答