我有一个 df 看起来像这样：
data = {'Cumulative': {0: 4, 1: 18, 2: 24, 3: 24, 4: 4, 5: 20, 6: 32, 7: 42}, 'Id': {0: 1, 1: 1, 2: 1, 3: 1, 4: 2, 5: 2, 6: 2, 7: 2}, 'Order': {0: '1-1', 1: '1-2', 2: '1-3', 3: '1-4', 4: '1-1', 5: '1-2', 6: '1-3', 7: '1-4'}, 'Period': {0: 1, 1: 2, 2: 3, 3: 4, 4: 1, 5: 2, 6: 3, 7: 4}, 'Time': {0: '1-1', 1: '1-2', 2: '1-3', …