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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Dynamic Zero Padding.
Date: Tue, 07 Jun 2011 22:56:42 -0400
References: <mailman.1.1307482621.11593.python-list@python.org>	<ism61s$grp$1@speranza.aioe.org> <4DEEAECB.4070601@codicesoftware.com>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:7209

On 6/7/2011 7:05 PM, John Posner wrote:

> You might want to try "new style" string formatting [1], which I think
> is better than the "old style" in this particular case:
>
>      >>> "Testing {0:0{1}d}".format(42, 4)
>     'Testing 0042'
>      >>> "Testing {0:0{1}d}".format(42, 9)
>     'Testing 000000042'

One cannot use a nested field in the 'name' part of the field (before 
the ':' (I tried), but are pretty free to nest in the actual 
specification part after the ':'.

 >>> '{0:{1}}'.format(7,'b')
'111'
 >>> '{0:{1}}'.format(7,'d')
'7'

-- 
Terry Jan Reedy