def select_number(self, rows: List[Row], column: NumberColumn) -> Number:
        """
        Select function takes a row (as a list) and a column name and returns the number in that
        column. If multiple rows are given, will return the first number that is not None.
        """
        numbers: List[float] = []
        for row in rows:
            cell_value = row.values[column.name]
            if isinstance(cell_value, float):
                numbers.append(cell_value)

        return numbers[0] if numbers else -1