def sum_(self, column):
        "Adds up all of the cells in a particular column of the table."
        data_type, index = self.__columns[column]
        total = data_type()
        for row in self.__data_area:
            total += self.__data_area[row][index]
        return total
Adds up all of the cells in a particular column of the table.
recipes/Python/577825_Rudimentary_Database_Engine/recipe-577825.py