Benjamin Peterson added the comment:
I believe the correct behavior is actually
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "bar.py", line 7, in <module>
C()
TypeError: foo.A.__new__(C) is not safe, use foo.B.__new__()
This is because A comes before B in the mro, and, indeed, constructing C with
A.__new__ is unsafe. In fact, reordering A and B in the definition of C fixes
everything.
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<http://bugs.python.org/issue25731>
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