[issue12029] Catching virtual subclasses in except clauses

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Since type has __subclasscheck__ (why I don't know)

Ouch, really? That means the PyType_IsSubtype path in PyObject_IsSubclass() is never taken?

I think we should add a tp_subclasscheck slot to minimize the general cost of this. Also, try to see if there aren't redundant type / tuple checks along the way.

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<http://bugs.python.org/issue12029>
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