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

Antoine Pitrou solipsis at pitrou.net
Thu Jun 14 21:57:34 CEST 2012

On Thu, 14 Jun 2012 12:46:38 -0700 Ethan Furman <ethan at stoneleaf.us> wrote:

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;

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). Whether a given function argument may be of several kinds at the same time is much less obvious to most people.

Regards

Antoine.

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