Python Pandas replace NaN in one column with value from corresponding row of second column

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Chapters
00:00 Question
01:40 Accepted answer (Score 258)
02:16 Answer 2 (Score 62)
02:33 Answer 3 (Score 10)
02:49 Answer 4 (Score 7)
03:30 Thank you

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Full question
https://stackoverflow.com/questions/2917...

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Tags
#python #pandas #dataframe #nan #fillna

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