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Date: Thu, 07 Mar 2013 14:06:03 -0500
From: John Posner <jjposner@optimum.net>
Subject: Re: Insert comma in number?
In-reply-to: <mailman.15214.1362647403.2938.python-list@python.org>
To: python-list@python.org, Peter Otten <__peter__@web.de>
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Xref: csiph.com comp.lang.python:40813

Peter Otten wrote:

> Last not least there's the option to employ locale-aware formatting:


Not quite last ... there's the mind-bending regular expression route:

   import re
   re.sub(r"(?<=\d)(?=(\d\d\d)+$)", ",", "12345678")   # 12,345,678
   re.sub(r"(?<=\d)(?=(\d\d\d)+$)", ",", "-54321")     # -54,321

-John