Returns a dictlist with values
            [
                {
                    "row": "row_a",
                    "col": "col_a",
                    "value": 1,
                }
            ]

def as_dictlist(self):
        """ Returns a dictlist with values
            [
                {
                    "row": "row_a",
                    "col": "col_a",
                    "value": 1,
                }
            ]
        """
        data = []
        for row_i, row in enumerate(self.row_index):
            for col_i, col in enumerate(self.col_index):
                value = self.values_by_row[row_i][col_i]
                data.append({
                    "row": row,
                    "col": col,
                    "value": value,
                    })
        return data