[Python-Dev] PEP 461: Adding % formatting to bytes and bytearray -- Final, Take 2

Stuart Bishop stuart at stuartbishop.net
Tue Feb 25 08:43:00 CET 2014

On 23 February 2014 08:56, Ethan Furman <ethan at stoneleaf.us> wrote:

> ``%a`` will call :func:``ascii()`` on the interpolated value's
> :func:``repr()``.
> This is intended as a debugging aid, rather than something that should be
> used
> in production.  Non-ascii values will be encoded to either ``\xnn`` or
> ``\unnnn``
> representation.

So we use %a for exactly the same purposes that we used to use %r.

> Unsupported codes
> -----------------
> ``%r`` (which calls ``__repr__`` and returns a :class:`str`) is not
> supported.

But you propose changing the code.

I think there would have been a lot less discussion if you just
defined %r to do what you propose for %a, as everything would work as
people expected.

Stuart Bishop <stuart at stuartbishop.net>

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