Ivan Levkivskyi <levkivs...@gmail.com> added the comment: This is not a bug, but a misunderstanding:
* First, ABCMeta doesn't have `__prepare__`, it is just `type.__prepare__` * Second, the third argument to `types.new_class` is called `kwds` for a reason. It is not a namespace like in `type` but the set of keywords in the equivalent class definition. For example: types.new_class('Test', (A, B), {'metaclass': Meta, 'foo': 42}) id equivalent to class Test(A, B, metaclass=Meta, foo=42): pass If you want to populate the namespace, then you should use the fourth argument `exec_body` which should be a callable that takes newly created dictionary and populates it with items. For your case it should be: C = new_class("C", (MyABC,), {}, exec_body=lambda ns: ns.update(namespace)) If you want to clarify the corresponding docstring, then please open a PR. Otherwise you can close the issue. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue33190> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com