How to interrupt a python program?

Question

I have made a program that essentially runs a loop like so:

while(true):
    i = 0
    while(i < 60):
        i += 1
        time.sleep(1)

I would like to be able to pause it while it is running and go back to it (keeping the i as it was when interrupted) . Currently the program has nothing to do with taking an input from the user and it just runs in the background. Is there a way to pause a running script in a way that will keep the code at the same state that it was when I paused it and be able to continue from that point? The program runs either on pycharm or normal Python 2.7 through the cmd.
(I have some basic knowledge of key logging and thread usage. So if that will work I am willing to try it out).

Does this answer your question? How to kill a while loop with a keystroke? — nsfyn55
– nsfyn55, Commented Dec 6, 2021 at 15:49

NerdOnTour · Accepted Answer · 2021-12-06 15:44:24Z

3

You could catch a keyboard interrupt exception (how you'd normally end the program) and then wait until the user presses enter again. That'd be something like this

while(true):
    i = 0
    while(i < 60):
        try:
            i += 1
            time.sleep(1)
        except KeyboardInterrupt:
            input('Press enter to continue')

edited Dec 6, 2021 at 15:44

NerdOnTour

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answered Dec 12, 2015 at 20:04

Cody Braun

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5 Comments

Eric Renouf Over a year ago

Though that would not keep your place in the inner loop for resuming

Cody Braun Over a year ago

Oh right, the try/except should probably be inside that loop

Yuval Eliav Over a year ago

a keyboard interrupt exception is ctr+z (eof)? because i would normally end the program by shutting down the pycharm debugger or the cmd window

Yuval Eliav Over a year ago

Okay... I tried this out and it doesn't work all the way. I can interrupt the program by using ctrl + c but when i get back pressing the enter button the window writes back to me "SyntaxError: unexpected EOF while parsing" plus , this does not work in the pycharm debugger for some reason

Yuval Eliav Over a year ago

problem solved! the input function is bad and raw_input works perfectly, thank you!

kwarunek · Accepted Answer · 2015-12-12 20:09:57Z

2

In *nix environment, simply press Ctrl+Z, process will be "paused" in background. To resume use commands: fg in foreground, bg in background. To see all jobs.

There is no action required in python to work this on linux.

answered Dec 12, 2015 at 20:09

kwarunek

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