How do I Pandas group-by to get sum?

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Track title: Hypnotic Puzzle4

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Chapters
00:00 Question
00:50 Accepted answer (Score 422)
01:20 Answer 2 (Score 256)
01:33 Answer 3 (Score 196)
02:14 Answer 4 (Score 61)
02:39 Thank you

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Full question
https://stackoverflow.com/questions/3992...

Accepted answer links:
[GroupBy.sum]: https://pandas.pydata.org/pandas-docs/st...

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Tags
#python #pandas #dataframe #groupby #aggregate

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