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In Python, how to do group by + mutate + ifelse like R?
| Author | Votes | Δ |
|---|---|---|
| datapug | 5 | +5.83 |
| user3483203 | 2 | +1.17 |
| jezrael | 1 | -1.90 |
Last visited: Aug 9, 2018, 9:00:57 PM