[issue38085] Interrupting class creation in __init_subclass__ may lead to incorrect isinstance() and issubclass() results

[Carl Friedrich Bolz-Tereick]

Carl Friedrich Bolz-Tereick <cfb...@gmx.de> added the comment:

Or, in other words, in my opinion this is the root cause of the bug:

class Base:
    def __init_subclass__(cls):
        global broken_class
        broken_class = cls
        assert 0
try:
    class Broken(Base): pass
except: pass
assert broken_class not in Base.__subclasses__()

The assert fails, which imo it shouldn't.

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<https://bugs.python.org/issue38085>
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