obj = exc_value.obj
        try:
            try:
                d = dir(obj)
            except TypeError:  # Attributes are unsortable, e.g. int and str
                d = list(obj.__class__.__dict__.keys()) + list(obj.__dict__.keys())
            d = sorted([x for x in d if isinstance(x, str)])
            hide_underscored = (wrong_name[:1] != '_')
            if hide_underscored and tb is not None:
                while tb.tb_next is not None:
                    tb = tb.tb_next
                frame = tb.tb_frame
                if 'self' in frame.f_locals and frame.f_locals['self'] is obj:
                    hide_underscored = False
            if hide_underscored:
                d = [x for x in d if x[:1] != '_']
        except Exception:
            return None