Return sorted list of tuples.

def _get_sorted_go2nt(self, go2nt, sortby):
        """Return sorted list of tuples."""
        if sortby is True:
            _fnc = self.get_fncsortnt()
            return sorted(go2nt.items(), key=lambda t: _fnc(t[1]))
        if sortby:
            return sorted(go2nt.items(), key=lambda t: sortby(t[1]))
        return go2nt.items()