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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