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Thu Jun 14 22:19:19 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-June/120250.html

2012/6/14 Ethan Furman <ethan at stoneleaf.us>:
> This is no different from what we have with strings now:
>
> --> 'aA'.islower()
> False
> --> 'aA'.isupper()
> False
> --> 'a'.islower()
> True
> --> 'A'.isupper()
> True
>
> We know that a string cannot be both all-upper and all-lower at the same
> time; likewise we know a variable cannot be both positional and kwargs.

This is much less clear cut as there's no clause in the Unicode
standard saying (!islower()  or !isupper()) must be true.

-- 
Regards,
Benjamin

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[Python-Dev] PEP 362 Third Revision