[Python-ideas] mixins as decorators vs inheritance [was: Automatic comparisons by default]
jimjjewett at gmail.com
Fri Mar 18 16:25:57 CET 2011
On Fri, Mar 18, 2011 at 9:58 AM, Mike Graham <mikegraham at gmail.com> wrote:
> On Fri, Mar 18, 2011 at 8:59 AM, Jim Jewett <jimjjewett at gmail.com> wrote:
>> On Thu, Mar 17, 2011 at 9:48 AM, Mike Graham <mikegraham at gmail.com> wrote:
>>> ... "Why do we ever do mixins through inheritance?"
>> (a) So we can do an isinstance check
> (a) is a misfeature. isinstance checks are bad:
> supporting-all-ordering-operations isn't a meaningful
> abstract category. It would also exclude all those
> classes that already exist and implement all six
Are there some limits to __instancecheck__ and __subclasscheck__ that
I just haven't run into yet? Why not write them to say "yes" if all
six operations are available?
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