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Wed May 16 12:28:40 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-May/119489.html

Martin v. Löwis wrote:
>  > And, we want this to somehow work with existing Python; we still
>  > support users on Python 2.4.
> 
> This makes the question out-of-scope for python-dev - we only discuss
> new versions of Python here. Old versions cannot be developed anymore
> (as they are released already).
> 
>> typedef struct {
>> unsigned long extension_id;
>> void *data;
>> } PyTypeObjectExtensionEntry;
>>
>> and then a type object can (somehow!) point to an array of these. The
>> array is linearly scanned
> 
> It's unclear to me why you think that a linear scan is faster than
> a dictionary lookup. The contrary will be the case - the dictionary
> lookup (PyObject_GetAttr) will be much faster.

PyObject_GetAttr does a lot more than just a dictionary lookup.

Perhaps making _PyType_Lookup() public might provide what it is needed?

> 
> Just make sure to use interned strings, and to cache the interned strings.
> 
> Regards,
> Martin
> 
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[Python-Dev] C-level duck typing