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To: python-list@python.org
From: Benjamin Peterson <benjamin@python.org>
Subject: Re: sys.stdout.detach() results in ValueError
Date: Thu, 8 Mar 2012 03:49:25 +0000 (UTC)
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Xref: csiph.com comp.lang.python:21369

Peter Kleiweg <pkleiweg <at> xs4all.nl> writes:
> Not yet using fp in any way, this script gives the following error:
> 
>     Exception ValueError: 'underlying buffer has been detached' in

You're probably using print() or some such which tries to write to sys.stdout.
It's safest to just write to sys.stdout.buffer rather than using detach.