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Date: Thu, 12 Jul 2012 14:31:50 +0200
From: Laszlo Nagy <gandalf@shopzeus.com>
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To: John Nagle <nagle@animats.com>, python-list@python.org
Subject: Re: How to safely maintain a status file
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>     Renaming files is the wrong way to synchronize a
> crawler.  Use a database that has ACID properties, such as
> SQLite.  Far fewer I/O operations are required for small updates.
> It's not the 1980s any more.
I agree with this approach. However, the OP specifically asked about 
"how to update status file".