New submission from Tomasz Rzepecki <rzepeck...@gmail.com>:
There seems to be no way to transparently make an abstract base class enforce instance attributes for subclasses (without creating a custom metaclass, see e.g. https://newbedev.com/python-abstract-class-shall-force-derived-classes-to-initialize-variable-in-init). The analogous problem for enforcing *class* attributes in subclasses can be solved by creating an abstract class property (which can then be overridden by a class attribute), but this feels like a hack and possibly a bug (see https://bugs.python.org/issue44904 for a related bug). The corresponding "solution" for instance attributes does not work (see attached file), and probably rightly so. This seems like an oversight to me. ---------- files: example.py messages: 399486 nosy: rzepecki.t priority: normal severity: normal status: open title: Abstract instance and class attributes for abstract base classes type: enhancement versions: Python 3.9 Added file: https://bugs.python.org/file50213/example.py _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue44905> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
