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Fri May 13 07:56:34 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-May/144586.html

On 13 May 2016 at 21:00, Steven D'Aprano <steve at pearwood.info> wrote:
> On Thu, May 12, 2016 at 08:53:12PM +0000, Brett Cannon wrote:
>
>> Second draft that takes Guido's comments into consideration. The biggest
>> change is os.fspath() now returns whatever path.__fspath__() returns
>> instead of restricting it to only str.
>
> Counter suggestion:
>
> - __fspath__() method may return either bytes or str (no change
>   from the PEP as it stands now);
>
> - but os.fspath() will only return str;
>
> - and os.fspathb() will only return bytes;

We don't have any use cases for a bytes-only API - only str-or-bytes
(in the polymorphic low level functions) and str-only (in newer high
level APIs like pathlib).

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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[Python-Dev] File system path PEP, part 2