[Python-Dev] PEP 362 Third Revision

Thu Jun 14 22:21:03 CEST 2012

On Thu, Jun 14, 2012 at 12:57 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
> On 2012年6月14日 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.

Is it obvious to most people? No. Is it obvious to most users of this
functionality? I would expect so. This isn't some implementation
detail, this is a characteristic of python parameters. If you don't
understand it, you are probably not the audience for signature.
>> Regards
>> Antoine.
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