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    Answers and rating deltas for
    In Python DataFrame how to find out number of rows that have valid values of columns
| Author | Votes | Δ | 
|---|---|---|
| b2002 | 2 | +2.27 | 
| Mabel Villalba | 2 | +1.35 | 
| ipramusinto | 1 | -3.63 | 
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