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From: John Gordon <gordon@panix.com>
Newsgroups: comp.lang.python
Subject: Re: Issue with continous incrementing of unbroken sequence for a entire working day
Date: Thu, 28 Feb 2013 19:23:19 +0000 (UTC)
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In <mailman.2663.1362078015.2939.python-list@python.org> Morten Engvoldsen <mortenengv@gmail.com> writes:

> But, if i save the serial_ number value in file, then how  will it decide
> to reset the serial number to '1' when the batch  runs on next working day.

Name the file so that it contains the date, i.e. "serial_numbers.2013-02-28".

If the file exists, you know that the program has already run today and
you can read the file to obtain the previous serial number.

If the file does not exist, you know the program has not yet run today
and you can start the serial number at 1.

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon@panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"