Eryk Sun <eryk...@gmail.com> added the comment:
> Have you tried this on Windows or macOS?
3.5+ in Windows uses ucrt, which quietly ignores 'E' and 'O' strftime
modifiers. From ucrt\time\wcsftime.cpp:
// Skip ISO E and O alternative representation format modifiers. We
// do not support alternative formats in any locale.
if (*format_it == L'E' || *format_it == L'O')
{
++format_it;
}
Example:
>>> locale.setlocale(locale.LC_ALL, 'ca_ES.utf8')
'ca_ES.utf8'
>>> time.strftime('%b|%Ob')
'set.|set.'
2.7 uses the old MSVC runtime, in which the 'E' and 'O' modifiers are invalid.
Example:
>>> locale.setlocale(locale.LC_ALL, 'cat_esp')
'Catalan_Spain.1252'
>>> time.strftime('%b')
'set.'
>>> time.strftime('%Ob')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: Invalid format string
----------
nosy: +eryksun
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<https://bugs.python.org/issue38228>
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