Dennis Sweeney <sweeney.dennis...@gmail.com> added the comment:

Oh yeah -- Py_EnterRecursiveCall/Py_LeaveRecursiveCall in abstract_get_bases 
would be simpler. Also, the set approach also probably still c-stack overflows 
on

class C:
    def __getattr__(self, attr):
        class A: pass
        class B: pass
        A.__getattr__ = B.__getattr__ = C.__getattr__
        return (A(), B())

issubclass(C(), int)

----------
nosy: +Dennis Sweeney

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue30570>
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