DOC: clarify Series.map behavior for categorical dtype #62338
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mroeschke
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Sep 15, 2025
pandas/core/arrays/categorical.py
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| Notes | ||
| ----- | ||
| The mapping function is applied to the categories, not to | ||
| each element of the array. | ||
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Can you show this in the Examples section instead?
mroeschke
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Sep 15, 2025
pandas/core/series.py
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| When the Series has ``dtype="category"``, the function is applied | ||
| to the categories and not to each individual value. This means | ||
| that if the same category appears multiple times, the function is | ||
| only called once for that category, and the result is reused for | ||
| all occurrences. Missing values (NaN) are not passed to the function. | ||
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I think this is sufficiently shown in the example below
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moved categorical note into Categorical.map Examples and removed redundant paragraph from Series.map Note |
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can you get the CI passing |
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.