Groups > comp.lang.python > #20119

Re: Formate a number with commas

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Date	Thu, 09 Feb 2012 17:57:42 -0500
From	John Posner <jjposner@optimum.net>
Subject	Re: Formate a number with commas
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On 2:59 PM, noydb wrote:
> How do you format a number to print with commas?

I would readily admit that both the "locale" module and "format" method
are preferable to this regular expression, which certainly violates the
"readability counts" dictum:

    r"(?<=\d)(?=(\d\d\d)+$)"

# python 2.6.6
import re
find_blocks = re.compile(r"(?<=\d)(?=(\d\d\d)+$)")
for numstr in "1 12 123 1234 12345 123456 1234567 12345678".split():
    print find_blocks.sub("," , numstr)

output is:

1
12
123
1,234
12,345
123,456
1,234,567
12,345,678

-John

Thread

Formate a number with commas noydb <jenn.duerr@gmail.com> - 2012-02-09 12:08 -0800
  Re: Formate a number with commas Neil Cerutti <neilc@norwich.edu> - 2012-02-09 20:17 +0000
  Re: Formate a number with commas Peter Otten <__peter__@web.de> - 2012-02-09 21:39 +0100
  Re: Formate a number with commas Chris Rebert <clp2@rebertia.com> - 2012-02-09 12:51 -0800
  Re: Formate a number with commas Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2012-02-09 22:13 +0100
  Re: Formate a number with commas Peter Otten <__peter__@web.de> - 2012-02-09 22:16 +0100
  Re: Formate a number with commas Chris Rebert <clp2@rebertia.com> - 2012-02-09 14:12 -0800
  Re: Formate a number with commas John Posner <jjposner@optimum.net> - 2012-02-09 17:57 -0500
  Re: Formate a number with commas Terry Reedy <tjreedy@udel.edu> - 2012-02-09 22:06 -0500

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