Named integers and enums

[Hallvard B Furuseth]

Scott David Daniels wrote:
>Hallvard B Furuseth wrote:
> 
>> I wonder: isinstance() says that even classic class instances are 'object'
>> instances, even though they do not seem to be (since __slots__ does not
>> work):
>>   >>> class o: __slots__ = ()
>>   ... 
>>   >>> isinstance(o(), object)
>>   1
>>   >>> o().foo = True
>>   >>> 
>
> Actually __slots__ works, you just have a funny idea of what __slots__
> is _for_.  __slots__ is a _storage_optimization_.

That's not what I mean.

I'm wondering why isinstance() claims that instances of 'o' are
instances of 'object', when 'o' is not declared to be a subclass of
'object'.

I used __slots__ to check if 'o' is a subclass of 'object' anyway, since
__slots__ is documented to only work for new-style classes - i.e.
classes derived from 'object'.  Well, it is not.  If it had been, the
assignment to o().foo above would have failed.

-- 
Hallvard