[Python-Dev] PEP 362 Third Revision

Thu Jun 14 22:19:19 CEST 2012

2012年6月14日 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