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

INADA Naoki songofacandy at gmail.com
Sat Jan 11 04:30:23 CET 2014

To avoid implicit conversion between str and bytes, I propose adding only limited %-format, not .format() or .format_map().

"limited %-format" means:

%c accepts integer or bytes having one length. %r is not supported %s accepts only bytes. %a is only format accepts arbitrary object.

And other formats is same to str.

On Sat, Jan 11, 2014 at 8:24 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

On Fri, 10 Jan 2014 18:14:45 -0500 "Eric V. Smith" <eric at trueblade.com> wrote: > > >> Because embedding the ASCII equivalent of ints and floats in byte streams > >> is a common operation? > > > > Again, if you're representing "ASCII", you're representing text and > > should use a str object. > > Yes, but is there existing 2.x code that uses %s for int and float > (perhaps unwittingly), and do we want to "help" that code out? > Or do we > want to make porters first change to using %d or %f instead of %s?

I'm afraid you're misunderstanding me. The PEP doesn't allow for %d and %f on bytes objects. > I think what you're getting at is that in addition to not calling > format, we don't want to call str, either, for the same reason. Not only. We don't want to do anything that actually asks for a textual representation of something. %d and %f ask for a textual representation of a number, so they're right out. Regards Antoine.

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