Assuming that I have the next data frame: flag | price ---------------------- 1 |47.808764653746 1 |47.808764653746 1 |31.9869279512204 1 |47.7907893713564 1 |16.7599200038239 1 |16.7599200038239 1 |20.3916014172137
How can I create a data frame with an extra indexed column as the next one: flag | price | index ----------------------|------- 1 |47.808764653746 | 0 1 |47.808764653746 | 1 1 |31.9869279512204| 2 1 |47.7907893713564| 3 1 |16.7599200038239| 4 1 |16.7599200038239| 5 1 |20.3916014172137| 6 -- Cesar Flores
