STINNER Victor <vstin...@python.org> added the comment:

> Now, the correct way in all this would be to just call setlocale(LC_ALL, '') 
> at the start of the application

Python now does that during its initialization on all platforms. So 
getpreferredencoding(False) is what its documentation says: the user preferred 
encoding, the LC_CTYPE locale encoding.

On Python 3.7, _Py_SetLocaleFromEnv(LC_CTYPE) was called in 
_Py_InitializeCore() on Unix, but not on Windows.

Since Python 3.8, _PyPreConfig_Write() calls _Py_SetLocaleFromEnv(LC_CTYPE) on 
all platforms including Windows. See bpo-34485 and my article for more details 
("C locale on Windows" section):
https://vstinner.github.io/python3-locales-encodings.html

_Py_SetLocaleFromEnv(LC_CTYPE) calls setlocale(LC_CTYPE, ""), but has more 
complex code on Android.

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<https://bugs.python.org/issue43552>
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