C-API, tp_dictoffset vs tp_members
"Martin v. Löwis"
martin at v.loewis.de
Sun Jul 26 23:24:43 CEST 2009
>>>>> I have a predefined set of members, some of which are optional.
>>>> Having optional fields is also a good reason.
>>> What is the use of T_OBJECT_EX vs T_OBJECT in PyMemberDef then?
>> Right - this works for optional objects. However, it can't possibly
>> work for any of the other fields.
> I have two members, one T_OBJECT and one T_OBJECT_EX. Both are NULL and both
> still appear in the dir() output. For one, accessing it returns 'None', for
> the other it raises an exception. I would have expected an element that is
> not accessible, not even 'None', to also not be visible in dir().
I understood your expectation already. I maintain my theory that it
shows up because there is a descriptor on the class.
>> I suppose that's because there will still be a descriptor for the
>> field in the class.
> So is that intentional or is it dir() that could be improved there?
It's probably both.
> Should I file a bugreport?
Only if you can provide a patch also. My guess is that when you have
the patch completed, you might realize that it is not an improvement,
despite achieving what you wanted to achieve.
More information about the Python-list