def _get(self, pos):
        """loads widget at given position; handling invalid arguments"""
        res = None, None
        if pos is not None:
            try:
                res = self[pos], pos
            except (IndexError, __HOLE__):
                pass
        return res
dataset/ETHPy150Open kdart/pycopia/QA/pycopia/QA/tui/walkers.py/TreeWalker._get