[Python-Dev] PEP 362 Third Revision

[Ethan Furman]

Antoine Pitrou wrote:
> On Thu, 14 Jun 2012 09:32:59 -0700
> Benjamin Peterson <benjamin at python.org> wrote:
>>> How about adding 'kind' and keeping 'is_*' attributes,
>>> but making them read-only dynamic properties, i.e.:
>>>
>>>   class Parameter:
>>>       ...
>>>
>>>       @property
>>>       def is_vararg(self):
>>>           return self.kind == 'vararg'
>>>
>>>       ...
>>>
>>> ?
>> Seems a bit bloatly to me. (One way to do it.)
> 
> Agreed with Benjamin.
> Also, the "is_*" attributes are misleading: it looks like they are
> orthogonal but only one of them can be true at any time.

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; likewise we know a variable cannot be both positional and kwargs.

~Ethan~