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Wed Dec 6 19:37:04 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-December/151118.html

On 7 December 2017 at 08:20, Victor Stinner <victor.stinner at gmail.com> wrote:
> 2017-12-06 23:07 GMT+01:00 Antoine Pitrou <solipsis at pitrou.net>:
>> One question: how do you plan to test for the POSIX locale?
>
> I'm not sure. I will probably rely on Nick for that ;-) Nick already
> implemented this exact check for his PEP 538 which is already
> implemented in Python 3.7.
>
> I already implemented the PEP 540:
>
>    https://bugs.python.org/issue29240
>    https://github.com/python/cpython/pull/855
>
> Right now, my implementation uses:
>
>    char *ctype = _PyMem_RawStrdup(setlocale(LC_CTYPE, ""));
>    ...
>    if (strcmp(ctype, "C") == 0) ...

We have a private helper for this as a result of the PEP 538
implementation: _Py_LegacyLocaleDetected()

Details are in the source code at
https://github.com/python/cpython/blob/master/Python/pylifecycle.c#L345

As per my comment there, and Jakub Wilk's post to this thread, we're
missing a case to also check for the string "POSIX" (which will fix
several of the current locale coercion discrepancies between Linux and
*BSD systems).

Cheers,
Nick.

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

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[Python-Dev] PEP 540: Add a new UTF-8 mode (v2)