Python Subprocess communicate fails after terminate

Question

I'm experiencing an issue where a call to proc.communicate() still hangs even after calling proc.terminate() .

I create tasks to be run in the background with the call

import subprocess as sub
p = sub.Popen(command, stdout=sub.PIPE, stderr=sub.PIPE, shell=False)

At the completion of the script, I call terminate() , communicate() , and wait() to gather information from the process.

p.terminate()
errorcode = p.wait()
(pout, perr) = p.communicate()

The script hangs at the call to communicate. I'd assumed that any call to communicate that follows a call to terminate would return immediately. Is there any reason why this would fail?

Edit: I'm using this method because the command is really a tight loop that won't terminate on its own. I'd like to use p.terminate() to do that, and then see what the stdout and stderr has to offer.

Answer 1

You don't need the first two statements. Just call communicate() .