Pandas custom aggregate function with condition on group, is it possible?

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Chapters
00:00 Question
03:34 Accepted answer (Score 1)
05:09 Answer 2 (Score 2)
06:17 Answer 3 (Score 1)
08:20 Thank you

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Full question
https://stackoverflow.com/questions/6...

Answer 2 links:
[datar]: https://github.com/pwwang/datar
[datar]: https://github.com/pwwang/datar

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Tags
#python #pandas #dataframe #pandasgroupby

#avk47