How to conditionally drop rows in pandas

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Chapters
00:00 Question
01:55 Accepted answer (Score 6)
02:44 Answer 2 (Score 2)
03:10 Answer 3 (Score 2)
04:03 Answer 4 (Score 1)
05:03 Thank you

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Full question
https://stackoverflow.com/questions/5999...

Answer 1 links:
[Series.Shift]: https://pandas.pydata.org/pandas-docs/st...
[Series.bfill]: https://pandas.pydata.org/pandas-docs/st...

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Tags
#python #pandas

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