Efficient grouping in pandas based on another Series

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Chapters
00:00 Question
01:12 Accepted answer (Score 2)
02:27 Answer 2 (Score 0)
03:07 Thank you

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Full question
https://stackoverflow.com/questions/4292...

Accepted answer links:
[isin]: http://pandas.pydata.org/pandas-docs/sta...

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Tags
#python #python3x #pandas #dataframe #groupby

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