[Greg Ewing]
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.
This smells like a bug that brings issubclass() out of sync with isinstance().
Perhaps issubclass() should do what the docs say and start by
testing whether A and B are the same object.
Raymond
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