At https://docs.python.org/3.5/faq/extending.html#can-i-create-an-object-class-with-some-methods-implemented-in-c-and-others-in-python-e-g-through-inheritance
it says In Python 2.2, you can inherit from built-in classes such as int, list, dict, etc. So is it 3.5 or 2.2? For some reason google takes me to the 3.3 docs Replacing the 3.3 by 3.5 seems to keep the same entry -- https://mail.python.org/mailman/listinfo/python-list
