I first ask this on python users. But I think the only people that can answer are the core developers. I have a python3 C++ extension that works written using the PyCXX C++ interface. But dir(obj) does not return the list of member variables. With the python2 version supporting the __members__ variable was all that was needed. But __members__ been removed from python3. How should I support dir() from the C API? I cannot use tp_members, not appropiate to the code I'm writing. If I provide __dir__ I then hit the problem I need the C API version of: all_attr = super( mytype, obj ).__dir__(); all_attr.extend( mytype_variable_names ); return all_attr I'm not getting inspiration from the python 3.6 sources for this problem. I did find the object_dir function in typeobject.c, but that has not helped get me move forward. What is the the patten that I should implement? Barry PyCXX