Better use a class decorator or a metaclass?(was: super not behaving as I expected)

[Antoon Pardon]

Op 29/03/20 om 16:49 schreef Peter Otten:
> Antoon Pardon wrote:
> 
>>
>> I have the following program
>>
>> class slt:
>>     __slots__ = ()
>>
...
>>
>> class slt1 (slt):
>>     __slots__ = 'fld1', 'fld2'
>>
...
>>
>> class slt2(slt1):
>> __slots__ = 'fld3',
>>
....
> Anyway, here's my attempt to collect inherited slots:
> 
>     @classmethod
>     def get_slots(cls):
>         all_slots = set()
>         for C in cls.__mro__:
>             try:
>                 slots = C.__slots__
>             except AttributeError:
>                 assert C is object
>             else:
>                 all_slots.update(slots)
>         return all_slots
> 

I have been thinking about this. AFAIU the slots are static data. So it
seems a bit odd to calculate them with a (class) method.

This seems a reasonable opportunity to use a class decorator or a
metaclass. But I am in doubt about which would be the better solution here.

-- 
Antoon Pardon.