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From: Antoine Pitrou <solipsis@pitrou.net>
Subject: Re: Speeding up Python's exit
Date: Fri, 1 Mar 2013 19:10:53 +0000 (UTC)
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Grant Edwards <invalid <at> invalid.invalid> writes:
> 
> > I assume that the memory used by the Python process will be reclaimed
> > by the operating system, but other resources such as opened files may
> > not be.
> 
> All open files (including sockets, pipes, serial ports, etc) will be
> flushed (from an OS standpoint) and closed.

According to POSIX, no, open files will not be flushed:

“The _Exit() and _exit() functions shall not call functions registered with 
atexit() nor any registered signal handlers. Open streams shall not be flushed. 
Whether open streams are closed (without flushing) is implementation-defined.”

http://pubs.opengroup.org/onlinepubs/9699919799/functions/_exit.html

(under the hood, os._exit() calls C _exit())

Regards

Antoine.