How can I use the apply() function for a single column?

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Chapters
00:00 Question
00:29 Accepted answer (Score 633)
00:55 Answer 2 (Score 146)
01:14 Answer 3 (Score 116)
10:31 Answer 4 (Score 63)
11:01 Thank you

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Full question
https://stackoverflow.com/questions/3496...

Answer 2 links:
[in this SO post]: https://stackoverflow.com/a/19922732/857...
[this one]: https://stackoverflow.com/a/52854800/857...
[does only accept callables]: https://pandas.pydata.org/pandas-docs/st...
[seldom the best solution]: https://stackoverflow.com/questions/5443...
[not vectorized]: https://stackoverflow.com/q/38697404/857...
[combination with groupby()]: https://stackoverflow.com/a/54433552/857...
[GroupBy.apply()]: https://pandas.pydata.org/pandas-docs/st...
[this SO post]: https://stackoverflow.com/a/56300992/857...
[documentation states]: https://pandas.pydata.org/pandas-docs/st...
[main use case for ]: https://github.com/pandas-dev/pandas/iss...
[boolean indexing]: https://pandas.pydata.org/pandas-docs/st...
[the official pandas user guide]: https://pandas.pydata.org/pandas-docs/st...
[if you are just applying a NumPy reduction function]: https://pandas.pydata.org/pandas-docs/st...
[Numba]: http://numba.pydata.org/
[swifter]: https://github.com/jmcarpenter2/swifter

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Tags
#python #pandas #dataframe

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