New submission from Jazeps Basko <jazeps.ba...@gmail.com>:
I am creating and registering singleton instances of subclasses of ABC in the ABC's __init_subclass__ and I just noticed that I am able to instantiate even the classes which have abstract methods. import abc class Base(abc.ABC): def __init_subclass__(cls, **kwargs): instance = cls() print(f"Created instance of {cls} easily: {instance}") @abc.abstractmethod def do_something(self): pass class Derived(Base): pass Actual Output: Created instance of <class '__main__.Derived'> easily: <__main__.Derived object at 0x10a6dd6a0> Expected Output: TypeError: Can't instantiate abstract class Derived with abstract methods do_something ---------- messages: 334284 nosy: jbasko priority: normal severity: normal status: open title: Able to instantiate a subclass with abstract methods from __init_subclass__ of the ABC type: behavior versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35815> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com