filtering rows after a groupby and apply a function

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Chapters
00:00 Question
01:26 Accepted answer (Score 3)
01:45 Thank you

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Full question
https://stackoverflow.com/questions/6070...

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

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Tags
#python #pandas #pandasgroupby

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