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Thu Jun 14 22:24:39 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-June/120252.html

2012/6/14 Alexandre Zani <alexandre.zani at gmail.com>:
> On Thu, Jun 14, 2012 at 12:57 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
>> 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.
>
> 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.

Consequently, the "kind" model should match up very well with their
understanding that a parameter can only be one "kind" at a time.

-- 
Regards,
Benjamin

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[Python-Dev] PEP 362 Third Revision