python from blaze import data, by dataset = data(([1, 2, 3], [4, 5, 6]), ('x', 'y')) subset = dataset[1:] sorted_data = subset.sort('x') aggregated_data = sorted_data.groupby('x').aggregate(sum_y=by(sorted_data.y.sum())) print(aggregated_data[sorted_data.x, aggregated_data])