[issue38085] Interrupting class creation in __init_subclass__ may lead to incorrect isinstance() and issubclass() results
Carl Friedrich Bolz-Tereick
report at bugs.python.org
Thu Dec 23 15:42:44 EST 2021
Carl Friedrich Bolz-Tereick <cfbolz at 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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