Python - How to launch a subprocess before exiting the program (which is running on a detached screen)?

Question

For some reason, I would like to launch a script just before exiting my current one. I found one simple way to do it:

script1.py:

#**
#some code
#**
p=subprocess.Popen(["python", "script2.py"])

With this, if I run script1, it will launch script2 at the end just before exiting.

However if I run script1 within a screen (screen python script1.py), the screen will terminate before script2 has even a chance to start.

Moreover, since script2 is very long, I would like not to wait that it ends before exiting script1. Is there a way to do it? Maybe by launching script2 in another screen? If so how can I do this?

heemayl · Accepted Answer · 2018-07-16 11:25:29Z

1

You can create the second script and then wait for it to complete

p=subprocess.Popen(["python", "script2.py"])
p.wait()

or more elegantly you can use os.execv that will replace your python interpreter by the new one (the PID will stay unchanged, you'll keep the console).

os.execv("/usr/bin/python", ["/usr/bin/python", "script2.py"])

edited Jul 16, 2018 at 11:25

heemayl

42.5k10 gold badges86 silver badges87 bronze badges

answered Aug 12, 2014 at 13:25

Nicolas Defranoux

2,6761 gold badge13 silver badges13 bronze badges

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

3 Comments

Thematrixme Over a year ago

I like your os.execv idea, but if I understood the function it won't execute anything after the subprocess call in script1? For example if I have things like print "script2 has been launched" just after the subprocess call and before the exiting of script1, they won't be executed?

Nicolas Defranoux Over a year ago

That's it, the message will not be printed: Your process will die and be replaced by the new one, nothing after this system call will be executed.

Thematrixme Over a year ago

Thanks, that's exactly what I'm looking for, I'll just run before this the few things I wanted to run after and that'll do it!

Collectives™ on Stack Overflow

Python - How to launch a subprocess before exiting the program (which is running on a detached screen)?

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related