Gareth Rees added the comment:
This is a race condition — when os.kill returns, that means that the signal has
been delivered, but it does not mean that the subprocess has exited yet. You
can see this by inserting a sleep after the kill and before the liveness check:
print(proc.is_alive())
os.kill(proc.pid, signal.SIGTERM)
time.sleep(1)
print(proc.is_alive())
This (probably) gives the process time to exit. (Presumably the
psutil.pid_exists() call has a similar effect.) Of course, waiting for 1 second
(or any amount of time) might not be enough. The right thing to do is to join
the process. Then when the join exits you know it died.
----------
nosy: +g...@garethrees.org
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30976>
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