Eryk Sun <eryk...@gmail.com> added the comment:
> What does use getlocale is time.strptime and datetime.datetime.strptime
calendar.LocaleTextCalendar also uses getlocale() and getdefaultlocale(). The
result from getdefaultlocale() cannot be set via setlocale() in Windows, which
also breaks resetlocale().
>>> locale.getdefaultlocale()
('en_GB', 'cp1252')
>>> locale._build_localename(locale.getdefaultlocale())
'en_GB.cp1252'
This is doubly invalid. It's a BCP-47 locale name with an encoding that's not
UTF-8. As of Windows 10 v1803, UTF-8 is supported in ucrt locales, and for
BCP-47 locale names, only UTF-8 is allowed to be set explicitly. (If not set to
UTF-8 explicitly, then ucrt implicitly uses the given locale's legacy ANSI code
page.) Even if something other than UTF-8 were allowed, ucrt will not accept a
code page with a "cp" prefix.
Default LocaleTextCalendar case:
>>> c = calendar.LocaleTextCalendar()
>>> try: c.formatweekday(1, 10)
... except Exception as e: print(e)
...
unsupported locale setting
It works as long as setting the locale succeeds and it can restore the original
locale. For example, setting "es" (Spanish):
>>> c = calendar.LocaleTextCalendar(locale='es')
>>> locale.setlocale(locale.LC_TIME, 'C')
'C'
>>> c.formatweekday(1, 10)
' martes '
Now try with the current locale as a BCP-47 locale name.
>>> locale.setlocale(locale.LC_TIME, 'en')
'en'
The parsed getlocale() result is, like with the default locale, doubly invalid.
It's a BCP-47 locale name with an encoding that's not UTF-8, and the
'ISO8859-1' codeset is meaningless to ucrt.
>>> locale.getlocale(locale.LC_TIME)
('en_US', 'ISO8859-1')
So restoring the locale fails:
>>> try: c.formatweekday(1, 10)
... except Exception as e: print(e)
...
unsupported locale setting
and it's still set to "es":
>>> locale.setlocale(locale.LC_TIME)
'es'
----------
nosy: +eryksun
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43115>
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