def _pad_rows(self, rows):
        keys = set([])
        for row in rows:
            keys.update(row.keys())
        for row in rows:
            for key in keys:
                if key not in row:
                    row[key] = None
        return rows
dataset/ETHPy150Open pudo/opennames/pepparser/model.py/EntityManager._pad_rows/original