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    Answers and rating deltas for
    Using pandas groupby on two column how to derived a new column
| Author | Votes | Δ | 
|---|---|---|
| cs95 | 4 | -0.00 | 
| Ashish Acharya | 4 | +1.96 | 
| user3483203 | 3 | -0.96 | 
Last visited: Jan 1, 2019, 8:55:20 AM