Python script embedded in bash, does not exit

Question

I'm having a curious problem. I have a bash script that is calling a python script within it. The python script executes successfully, but never fully terminates

Content of Bash script:

#! /usr/bin/env bash
python python_script.py
echo "bar"

content of Python script:

#Much stuff
sys.exit("The python script just ended")

What I expect to see on termination would be:

>The python script just ended
>bar

What I instead get is:

>The python script just ended

If I keyboard interrupt, the bash continues as:

^C>bar

What gives? Clearly the exit is calling properly, and there is nothing between that and the output statement in the bash script that called the python script.

(I can't necessarily give specifics on the workings of the "Much stuff" in the python script, as I'm modifying existing code that I don't fully understand. I've mostly left the workings of the script alone, and modified output more than anything for formatting, but I'm happy to try and provide you with any additional information requested)

That's weird, for me it works (only having sys.exit("The python script...") and echo bar in the bash script). — Niek de Klein
– Niek de Klein, Commented May 18, 2012 at 13:22
Does it still break if you remove everything apart from the sys.exit() line from the .py file? If not, the problem probably lies somewhere in #Much stuff — cdlk
– cdlk, Commented May 18, 2012 at 13:28
It does work if everythin in #Much stuff is removed. I just am unsure as to what I modified in that that caused this. I diff'd the original against my modified version and the only significant changes I could see were print formatting. — TrialbyCode
– TrialbyCode, Commented May 18, 2012 at 13:35

NPE · Accepted Answer · 2012-05-18 13:51:09Z

5

What sys.exit() does is throw an exception of type SystemExit. If your script were to catch this exception, it would continue executing past sys.exit().

Also, if you have non-daemon threads, these could be preventing the process from terminating.

If that's the case, you can either turn them into daemon threads, or somehow signal to them that you wish to exit the script, and let them shut themselves down.

Finally, there's os._exit(), but you should not have to resort to that.

edited May 18, 2012 at 13:51

answered May 18, 2012 at 13:23

NPE

503k114 gold badges970 silver badges1k bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

TrialbyCode Over a year ago

Is there a way to more completely terminate the script? The code I'm using does use some threads. (thank you for your quick answer by the way)

NPE Over a year ago

@TrialbyCode: The cleanest is probably to turn them into daemon threads. I've expanded the answer.

TrialbyCode Over a year ago

I had one non-daemon thread running. Daemonizing it fixed the exit hangup, but caused some cosmetic damage to my output, but now I know where my issue is. Now I just have to figure out why that happened as I didn't modify that section of the code at all. Thank you so much for your help @aix.

Tirelo SHIKWAMABANA · Accepted Answer · 2021-11-02 13:08:47Z

0

The following also works:

import os
print('Hellow world')
os._exit(os.EX_OK)

In Ubuntu, it exits the terminal. See also the example in this link Program With the os.exit() Method

answered Nov 2, 2021 at 13:08

Tirelo SHIKWAMABANA

394 bronze badges

Collectives™ on Stack Overflow

Python script embedded in bash, does not exit

2 Answers 2

3 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related