REGR: DataFrameGroupBy.agg with duplicate column names and a dict #55042
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rhshadrach
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mroeschke
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Sep 7, 2023
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Thanks @rhshadrach |
meeseeksmachine
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…te column names and a dict
mroeschke
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…uplicate column names and a dict) (#55056) Backport PR #55042: REGR: DataFrameGroupBy.agg with duplicate column names and a dict Co-authored-by: Richard Shadrach <[email protected]>
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got an unexpected keyword argument 'engine_kwargs'when doing groupby in 12.1.0 #55006 (Replace xxxx with the GitHub issue number)doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Unlike what I reported in #55006, the core issue is not how we treat kwargs. Rather, I believe the issue occurred in #52115 where logic specific for duplicate columns was added for Series/DataFrame but also impacted groupby.
This PR fixes the regression, but groupby still does not work with duplicate columns. I've confirmed groupby.agg does not work with duplicate columns in this case on 2.0.x, and believe it hasn't for a long time (possibly forever). For this, I've opened #55041.