> On 13 Jun 2017, at 23:49, Chris Angelico <ros...@gmail.com> wrote: > > On Wed, Jun 14, 2017 at 8:09 AM, Terry Reedy <tjre...@udel.edu> wrote: >> Perhaps you are looking for __dir__, called by dir(). >> >> " dir([object]) >> >> Without arguments, return the list of names in the current local scope. >> With an argument, attempt to return a list of valid attributes for that >> object. >> >> If the object has a method named __dir__(), this method will be called >> and must return the list of attributes." > > AIUI the OP is looking to implement __dir__, but make use of *what > dir() would have returned* in that function. Something like:
Yes. > > class Magic: > def __getattr__(self, attr): > if attr in self.generatables: > return self.generated_value(attr) > raise AttributeError > def __dir__(self): > return default_dir(self) + self.generatables > > 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. Today I solve the problem in 2.7 C extension code by providing a value for __members__. In python3 I have no idea how to do this in C. I can find no example code that addresses this problem. How am I supposed to code this without the __members__ trick? Did I miss the C API that implements default_dir(self)? Barry > > ChrisA > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
