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Python Pandas How to assign groupby operation results back to columns in parent dataframe?
| Author | Votes | Δ |
|---|---|---|
| Wouter Overmeire | 10 | +4.15 |
| Garrett | 5 | +1.37 |
| Wes McKinney | 2 | -0.26 |
| Def_Os | 0 | -3.46 |
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