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docs(python): Update reference to apply #15982

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merged 3 commits into from
May 3, 2024
Merged

docs(python): Update reference to apply #15982

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43a62af
Update reference to `apply`
avimallu May 1, 2024
5bdf34b
Merge branch 'pola-rs:main' into main
avimallu May 1, 2024
656c422
Reduce line length to satisfy `ruff`
avimallu May 1, 2024
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4 changes: 2 additions & 2 deletions py-polars/polars/dataframe/frame.py
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Expand Up @@ -6199,10 +6199,10 @@ def map_rows(

Notes
-----
* The frame-level `apply` cannot track column names (as the UDF is a black-box
* The frame-level `map_rows` cannot track column names (as the UDF is a black-box
that may arbitrarily drop, rearrange, transform, or add new columns); if you
want to apply a UDF such that column names are preserved, you should use the
expression-level `apply` syntax instead.
expression-level `map_elements` syntax instead.

* If your function is expensive and you don't want it to be called more than
once for a given input, consider applying an `@lru_cache` decorator to it.
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