On Wed, Jun 14, 2017 at 1:54 PM, Barry Scott <ba...@barrys-emacs.org> wrote: > > On 13 Jun 2017, at 23:49, Chris Angelico <ros...@gmail.com> wrote: > > For that purpose, is it possible to use super().__dir__()? Are there > > any considerations where that would fail? > > Remember that I need to do this in the C API and I want default_dir of self > in C not python. > > super().__dir__ looks at the class above me that is typically object() and so > is not useful > as it does not list the member function from my class or __mro__ or other > stuff I may not be aware of > that is important to return.
object.__dir__(your_class_instance) should generally return everything you would get if you didn't override __dir__ at all. Remember, that code doesn't mean "return the methods and attributes defined on the object class", it's "run the object class's __dir__ method with self=your_class_instance". I don't know off-hand if there's a nicer way to do this from C than to manually look up the "__dir__" attribute on PyBaseObject_Type. (And of course if you wanted to get really fancy and handle cases where your object inherits from some type other than 'object', or where some user sticks your type into a multiple-inheritance hierarchy, you might potentially want to find "__dir__" using super lookup instead of going directly to PyBaseObject_Type. From a quick google it looks like this page gives an approach for doing that: https://pythonextensionpatterns.readthedocs.io/en/latest/super_call.html) -n -- Nathaniel J. Smith -- https://vorpus.org _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
