Correct way to iterate over a dataframe using multiple conditionals

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Track title: Puzzle Game 3 Looping

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Chapters
00:00 Question
01:55 Accepted answer (Score 3)
02:56 Answer 2 (Score 3)
03:59 Thank you

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Full question
https://stackoverflow.com/questions/5989...

Question links:
[this answer]: https://stackoverflow.com/questions/2747...

Accepted answer links:
[DataFrame.melt]: https://pandas.pydata.org/pandas-docs/st...
[numpy.select]: https://docs.scipy.org/doc/numpy/referen...
[DataFrame.groupby]: https://pandas.pydata.org/pandas-docs/st...

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Tags
#python #pandas #dataframe

#avk47