Converts a dimension/category list of dicts into a data value \
           in three steps.

       Args:
           query(list): list of dicts with the desired query.

       Returns:
           value(float): numeric data value.

def get_value(self, query):
        """Converts a dimension/category list of dicts into a data value \
           in three steps.

       Args:
           query(list): list of dicts with the desired query.

       Returns:
           value(float): numeric data value.

       """
        indices = self.get_dimension_indices(query)
        index = self.get_value_index(indices)
        value = self.get_value_by_index(index)
        return value