[Python-Dev] PEP 460: allowing %d and %f and mojibake

[Nick Coghlan]

On 12 Jan 2014 22:10, "Paul Moore" <p.f.moore at gmail.com> wrote:
>
> On 12 January 2014 09:23, Georg Brandl <g.brandl at gmx.net> wrote:
> >> On 12 January 2014 01:01, Victor Stinner <victor.stinner at gmail.com>
wrote:
> >>> Supporting formating integers would allow to write b"Content-Length:
> >>> %s\r\n" % 123, which would work on Python 2 and Python 3.
> >>
> >> I'm surprised that no-one is mentioning b"Content-Length: %s\r\n" %
> >> str(123) which works on Python 2 and 3, is explicit, and needs no
> >> special-casing of int in the format code.
> >
> > Certainly doesn't work on Python 3 right now, and never should :)
>
> Sorry, I meant str(123).encode("ascii"), and I'd probably use a helper
> function for it.
>
> I could easily argue at this point that this is the type of bug that
> having %-formatting operations on bytes would encourage - %s means
> "format a string" (from years of C and Python (text) experience) so I
> automatically supply a string argument when using %s in a bytes
> formatting context.
>
> The reality is that I was probably just being sloppy, though :-)

It's also something asciistr will help with once it is working -
asciistr(123) on the RHS will work in both versions.

Cheers,
Nick.

> Paul
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