Christoph Gohlke <cgoh...@uci.edu> added the comment:
> Can someone please try to write an example which only uses the stdlib?
The simplest is to compare performance of the
`windll.LoadLibrary('API-MS-WIN-CRT-STRING-L1-1-0.DLL')` function on Python
3.7.0a3 and 3.7.0a4, but that will mostly measure Python/ctypes overhead. I
will post a minimal C extension instead.
> What are these extensions? Where do them come from?
The `isdigit` function is from the UCRT. The `parsers` Cython/C extension is
part of the pandas wheel on PyPI. The context for this issue is at
https://github.com/pandas-dev/pandas/issues/23516
> I don't understand which "locale changes" you are talking about. You can
> change the locale using locale.setlocale().
The `UCRT.isdigit` function, when run on Python >=3.7.0a4, calls the
`_isdigit_l` function, which calls `_LocaleUpdate::_LocaleUpdate` (see the VS
profiler output).
----------
nosy: +cgohlke
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