[issue10977] Concrete object C API needs abstract path for subclasses of builtin types
Nick Coghlan
report at bugs.python.org
Sun Mar 20 22:50:56 CET 2011
Nick Coghlan <ncoghlan at gmail.com> added the comment:
It's largely a backwards compatibility hack, but the concrete methods also have an optimised fast path that the generic methods lack.
So (for example), PyList_SetItem would now mean "this is *probably* a list, so check for that and use the fast path if the assumption is correct, otherwise fall back on PyObject_SetItem".
Currently, using the concrete API means your code potentially *breaks* if the assumption is incorrect.
Sounds like a good idea to me, and will fix a lot of cases of bad interaction between concrete types and related objects.
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nosy: +ncoghlan
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<http://bugs.python.org/issue10977>
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