使用Tkinter(Python 2.7)连续运行长进程 [英] Run long process continously using Tkinter (Python 2.7)

问题描述

一段时间后试图弄清楚Tkinter库的工作方式，我遇到了一个问题.我编写的脚本使用了多重处理，并且由于脚本需要尽可能快，因此我将进程之间的通信量减至最少.这意味着完成大量任务大约需要一分钟.

After some time trying to figure out how the Tkinter library works I have run into a problem. The script i wrote uses multiprocessing, and because the script needs to be as fast as possible I minimized the amount of traffic between the processes. This means that it takes about a minute to complete an enormous amount of tasks.

(如果该任务在中途中止，则使用的文件将被破坏).

(If this task gets aborted halfway through, the used files will get corrupted).

问题是我希望GUI中的停止按钮以正确的方式停止脚本.经过一番研究之后，我在寻找解决方案方面没有取得任何进展，因此也许有些人可以提供帮助.我基本上需要一种方法在执行任务的一半时告诉脚本它必须停止，此后脚本将继续执行直到任务完成.

The problem is that i want a stop button in my GUI to stop the script the proper way. After some research i haven't made any progress in finding a solution, so maybe some of you could help. I basically need a way to tell the script halfway through a task that it has to stop, after which the script will continue until the task is finished.

我的脚本的设置方式:

The way my script is set up:

(这缺少Tkinter部分，因为我还不知道解决方案).

(This is missing the Tkinter part, because i don't know the solution to it yet).

from multiprocessing import Pool

def Setup():
    #defines all paths of the files that are edited (and a whole lot more)

def Calculation(x, y, Primes):
    #takes an x and y value, calculates the value of that coordinate and determines
    #if the value is prime. Returns True of False, and the calculated value.

def Quadrant(List):
    #takes a huge list of coordinates that have to be calculated. These
    #coordinates (x and y) are passed to the 'Calculation' function, one by one.

    #Returns all the calculated coordinates and if they are prime or not (boolean)

if __name__ == "__main__":
    Filenames = Setup()
    Process = Pool(4)

    while True:
        #Loop the main bit of the code to keep expanding the generated image
        Input = [List of all coordinates, split into 4 quadrants (seperate lists) evenly]
        Output = Process.map(Quadrant, Input)

        #Combine all data and update list of primes

        #Detects if escape is pressed, stops if true.

我基本上是在寻找一种方法来停止上面的while循环或该循环的替代方法.

I am basically looking for a way to stop the while loop above, or an alternative to this loop.

推荐答案

我基本上是指该任务必须停止，而不能突然终止.该脚本必须等到其任务完成后，然后查看是否按下了按钮来决定是否必须继续

我们没有代码可响应，因此，如果您使用while()(请注意，如果某些条件为True/False，您也可以从函数中返回结果).

We have no code from you to respond to, so if you are using a while() (note that you can also just issue a return from the function if some condition is True/False).

import time
from multiprocessing import Process, Manager

def test_f(test_d):
   """  frist process to run
        exit this process when dictionary's 'QUIT' == True
   """
   while not test_d["QUIT"]:
      print "     test_f", test_d["QUIT"]
      time.sleep(1.0)

def test_f2(name):
    """ second process to run.  Runs until the for loop exits
   """
    for j in range(0, 10):
       print name, j
       time.sleep(0.5)

    print "second process finished"

if __name__ == '__main__':
   ##--- create a dictionary via Manager
   manager = Manager()
   test_d = manager.dict()
   test_d["QUIT"] = False

   ##---  start first process and send dictionary
   p = Process(target=test_f, args=(test_d,))
   p.start()

   ##--- start second process
   p2 = Process(target=test_f2, args=('P2',))
   p2.start()

   ##--- sleep 2 seconds and then change dictionary
   ##     to exit first process
   time.sleep(2.0)
   print "\nterminate first process"
   test_d["QUIT"] = True
   print "test_d changed"
   print "data from first process", test_d

   ##---  may not be necessary, but I always terminate to be sure
   time.sleep(5.0)
   p.terminate()
   p2.terminate()

   """ Thanks Doug Hellmann
       Note: It is important to join() the process after terminating it.
       in order to give the background machinery time to update the.
       status of the object to reflect the termination
   """
   p.join()
   p2.join()

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