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Sat Feb 14 02:27:29 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-February/086081.html

I've discovered something slightly misleading in the docs
for PyObject_IsInstance:

   When testing if B is a subclass of A, if A is B, PyObject_IsSubclass
   returns true. If A and B are different objects, B‘s __bases__
   attribute is searched...

This suggests that issubclass(A, A) will always be true,
regardless of what attributes A has. However, this turns
out not to be so -- A must also have a __bases__ attribute,
otherwise it's rejected as not being sufficiently class-like.

-- 
Greg

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[Python-Dev] Small misleadingness in docs