Message 195513 - Python tracker

Couldn't you make use of inspect.getattr_static()?

  getattr_static(obj.__class__, '__index__').__get__(obj)()

getattr_static() does some extra work to get do the right lookup.  I haven't verified that it matches _PyType_Lookup() exactly, but it should be pretty close at least.

Also, pickle (unfortunately) also does lookup on instances rather than classes for the special methods (issue #16251).