R. David Murray wrote:
We know that a string cannot be both all-upper and all-lower at the same
time;
We know that because it's common wisdom for everyone (although who knows
what oddities the unicode consortium may come up with in the future).
Indeed, there is at least one letter that is used in both upper case and
lower case, so the consortium could reasonably declare that it should
return True for both isupper and islower :).
If you're talking about the German double-s ß, technically it is a lowercase
letter and should be written as SS or SZ in uppercase.
Just to add complication, historically German used to have an uppercase ß, and
in recent years some designers have started to reintroduce it.
(Note: I am not a German speaker, and everything I say above is taken from
Wikipedia.)
--
Steven
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