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Sun Feb 23 21:42:59 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-February/132718.html

On 02/23/2014 03:33 AM, Antoine Pitrou wrote:
> On Sat, 22 Feb 2014 17:56:50 -0800
> 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.
>
> Why is "%a" here? I don't remember: was this discussed before?
> "Intended as a debugging aid" sounds like a weak justification to me.

https://mail.python.org/pipermail/python-dev/2014-January/131808.html

The idea being if we offer %a, folks won't be tempted to abuse __bytes__.

--
~Ethan~

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Showing content from https://mail.python.org/pipermail/python-dev/2014-February/132718.html below:

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