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From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Curious Omission In New-Style Formats
Date: Mon, 11 Jul 2016 13:27:16 -0600
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On Mon, Jul 11, 2016 at 12:54 PM, Terry Reedy <tjreedy@udel.edu> wrote:
> In any case, I think it an improvement to say that '0x00123' has a field
> width of 7 rather than a 'precision' of 5.
>
>>>> '{:#07x}'.format(0x123)  # specifiy field width
> '0x00123'
>>>> "%#0.5x" % 0x123  # specify int precision
> '0x00123'

It occurs to me now that this does create a challenge if the format is
meant to support negative numbers as well:

>>> '%#0.5x' % -0x123
'-0x00123'
>>> '{:#07x}'.format(-0x123)
'-0x0123'