DEPR: rename filter->select #62684
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DEPR: rename filter->select #62684
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rhshadrach
requested changes
Oct 15, 2025
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My preference here would be to remove the axis argument and have select only operate on columns, which would agree with PySpark and Polars. We could point users to using .loc for operating on rows (regex and like can be done via boolean masks as well). But I won't block on this.
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| :meth:`Series.select` and :meth:`DataFrame.select` | ||
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
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| The ``filter`` method is used to select a subset of rows that match certain criteria. | ||
| :meth:`Series.filter` and :meth:`DataFrame.filter` do not support user defined functions, | ||
| The ``select`` method is used to select a subset of rows that match certain criteria. | ||
| :meth:`Series.select` and :meth:`DataFrame.select` do not support user defined functions, | ||
| but :meth:`SeriesGroupBy.filter` and :meth:`DataFrameGroupBy.filter` do. You can read more | ||
| about ``filter`` in groupby operations in :ref:`groupby.filter`. |
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This section was really about groupby's filter (which is already filter-y). We only gave a head nod to other filters just because they had the same name so as not to cause confusion. Can we either just add that Series.filter and DataFrame.filter are deprecated or remove the lines about Series.filter and DataFrame.filter entirely.
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.cc @jorisvandenbossche want to make sure this doesn't catch you by surprise. To avoid API bikeshedding, this just renames filter->select without futzing with the signature etc. AFAICT the real benefit is going to be in freeing up "filter" to be eventually re-implemented to be actually filter-y.