BUG: df.loc[i] with Categorical column containing NaN #62255

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mroeschke merged 1 commit into pandas-dev:main from jbrockmendel:bug-58954

Sep 4, 2025

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jbrockmendel commented Sep 4, 2025

closes BUG: Column of dtype Categorical in DataFrame encounters error when taking a row that includes nan in the column #58954 (Replace xxxx with the GitHub issue number)
Tests added and passed if fixing a bug or adding a new feature
All code checks passed.
Added type annotations to new arguments/methods/functions.
Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

This does introduce value-dependent behavior in the dtype of df.iloc[i] but that seems better than raising, and will go away if/when we get to nullable-by-default.

BUG: df.loc[i] with Categorical column containing NaN

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mroeschke added Indexing Missing-data Categorical labels

mroeschke added this to the 3.0 milestone

mroeschke merged commit f1aaa39 into pandas-dev:main

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mroeschke commented Sep 4, 2025

Thanks @jbrockmendel

jbrockmendel deleted the bug-58954 branch

September 4, 2025 22:29

eicchen pushed a commit to eicchen/pandas that referenced this pull request

BUG: df.loc[i] with Categorical column containing NaN (pandas-dev#62255)

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