[Python-Dev] PEP 362 Third Revision (original) (raw)

Steven D'Aprano steve at pearwood.info
Fri Jun 15 10:02:40 CEST 2012

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

More information about the Python-Dev mailing list