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From: Antoine Pitrou <solipsis@pitrou.net>
Subject: Re: Writing to same file from two threads
Date: Fri, 1 Mar 2013 14:54:14 +0000 (UTC)
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Xref: csiph.com comp.lang.python:40259

Steven D'Aprano <steve+comp.lang.python <at> pearwood.info> writes:
> 
> On Wed, 27 Feb 2013 13:26:18 +0000, Antoine Pitrou wrote:
> 
> > For the record, binary files are thread-safe in Python 3, but text files
> > are not.
> 
> Where is this documented please?

In the documentation, of course ;)
http://docs.python.org/3.3/library/io.html#multi-threading

Regards

Antoine.