Antoine Pitrou <pit...@free.fr> added the comment:
Mainly to protect against potential infinite recursion with isinstance checks.
Also, performance is probably better.
Here are the relevant code and comments in PyErr_GivenExceptionMatches() (in
Python/errors.c):
/* PyObject_IsSubclass() can recurse and therefore is
not safe (see test_bad_getattr in test.pickletester). */
res = PyType_IsSubtype((PyTypeObject *)err, (PyTypeObject *)exc);
----------
nosy: +pitrou
versions: -Python 2.5, Python 2.6, Python 2.7, Python 3.3
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<http://bugs.python.org/issue10011>
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