Martin Panter <vadmium...@gmail.com> added the comment:

You probably only need to call "wait" once. That blocks the thread until it 
gets a result, so it is more CPU-efficient than calling "poll" in a busy loop.

Since you open a separate pipe for "stderr" in script.py, but don't do anything 
with it, there could be a deadlock with the child writing to the stderr pipe 
versus the parent reading from "stdout" or waiting for the exit status.

I guess your script is an approximation of the "sos" application. I don't have 
time to understand everything it is trying to do, but I added some comments at 
<https://github.com/sosreport/sos/commit/2fcf5f0#r30410300>.

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34566>
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