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[Python-Dev] RFC: PEP 460: Add bytes % args and bytes.format(args) to Python 3.5

Brett Cannon brett at python.org
Mon Jan 6 15:12:16 CET 2014 
On Mon, Jan 6, 2014 at 8:59 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> On Tue, 7 Jan 2014 00:54:17 +1100
> Chris Angelico <rosuav at gmail.com> wrote:
> > On Tue, Jan 7, 2014 at 12:44 AM, Antoine Pitrou <solipsis at pitrou.net>
> wrote:
> > > BTW, there's a subtlety here: ``%s`` currently means "insert the result
> > > of calling __str__", but bytes formatting should *not* call __str__.
> >
> > Since it derives from the C printf notation, it means "insert string
> > here". The fact that __str__ will be called is secondary to that. I
> > would say it's not a problem for bytes formatting to call __bytes__,
> > or in some other way convert to bytes without calling __str__.
> >
> > Will it be confusing to have bytes and str supporting distinctly
> > different format operations? Might it be better to instead create a
> > separate and very different method on a bytes, just to emphasize the
> > difference?
>
> The people who want bytes formatting, AFAICT, want something that is
> reasonably 2.x-compatible. That means using the same method / operator
> and calling conventions.
>

Right, but that also doesn't mean that a library from the Cheeseshop
couldn't be provided which works around any Python 2/3 differences. But my
suspicion is anyone requesting this feature (e.g. Mercurial) want it
implemented in C for performance and so some pure Python library to help
with this won't get any traction.
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