Narwhals

Changes

✨ Enhancements

- feat: add `Series|Expr.rank` (1342)

🐞 Bug fixes

- fix: fix license classifier (1751)

📖 Documentation

- docs: update api-completeness with `duckdb` (1740)

🛠️ Other improvements

- test: remove `cudf` from `tests/expr_and_series/replace_time_zone_test.py::test_replace_time_zone_none[cudf]` (1748)
- chore: filter old pyarrow/pandas warnings we cant do anything about (1746)
- [pre-commit.ci] pre-commit autoupdate (1741)

Thank you to all our contributors for making this release possible!
AlessandroMiola, Dhanunjaya-Elluri, EdAbati, FBruzzesi, MarcoGorelli, anopsy

Changes

- fix: always pass Column to pandas.spark.functions (1712)
- tests: add 'core' to nox dependencies (1713)
- feat: add `weekday` to Pandas, Dask and Arrow dt namespaces (1680)
- Link to Avoiding the UserWarning error while using Pandas group_by page when warning is thrown (1683)

✨ Enhancements

- feat: Implement partial "lazy" support for DuckDB (even with this PR, DuckDB support is work-in-progress!) (1725)
- feat: validate library minimum version in compliant objects (1727)
- feat: enable to cast to `Struct` dtype (1717)
- feat: Expressify `clip` arguments (1709)
- feat: add is_nan expression & series method (1625)
- feat: show native object (if possible) in repr (1702)
- feat: add `sum` and `sum_horizontal` for `SparkLike` (1693)
- feat: add some `SparkLikeLazyFrame` methods (1633)

🐞 Bug fixes

- fix: fix broken link from warning (1732)
- fix: nw.lit(date, dtype=nw.Date), loosen Dask minimum back to 2024.8 (1730)
- chore: simplify definitions of rhs expressions, bump dask minimum to 2024.10 (1720)
- fix: dask group by with kwargs (1676)
- fix: `DaskLazyFrame` and `ArrowDataFrame` `.with_row_index` column order (1706)
- fix: scalar reductions on empty inputs (1715)
- fix: remove `maintain_order` from LazyFrame.unique (1687)
- fix: modin dtype interoperability (1692)
- fix: Dask was raising for scalar vs Series binary operations (1684)
- fix: casting to List for cudf (1686)

📖 Documentation

- docs: `Expr` method' docstrings (1733)
- docs: let `nw.LazyFrame` docstrings examples run on Polars and Dask only (1700)
- docs: update null handling page with `is_nan` reference (1716)
- docs: add spark-like in backend completeness (1710)
- docs: `Series` method' docstrings (1699)
- docs: `DataFrame` method' docstrings (1688)

🛠️ Other improvements

- test: catch some cudf failures (1735)
- chore: refactor root_names and output_names tracking (1731)
- tests: remove unnecessary pytest filterwarnings (1691)
- chore: remove some lazy tests (1719)
- fix: Catch cuDF warning for concat with empty elements, and ComputeError for non-float is_nan (1718)
- chore: use `None` instead of `float('nan')` to check for null values in tests (1697)
- test: allow to run tests for Polars[gpu] (1698)
- test: Make constructors configurable when running tests (1694)

Thank you to all our contributors for making this release possible!
AlessandroMiola, DeaMariaLeon, EdAbati, FBruzzesi, MarcoGorelli, camriddell, dependabot, dependabot[bot], lucas-nelson-uiuc and lucianosrp

Changes

🐞 Bug fixes

- fix: `is_duplicated` was returning wrong-length result for PyArrow and Dask (1679)

Thank you to all our contributors for making this release possible!
DeaMariaLeon and MarcoGorelli

Changes

🚀 Performance improvements

- chore, perf: arrow cat namespace (1663)

✨ Enhancements

- feat: raise informative error message when grouping by expressions (1677)
- feat: expressify `lower_bound` and `upper_bound` in `is_between` (1672)
- feat: Relax cuDF minimum version to 24.10.0 (1649)
- Feat/add collect schema to interchange dfs (1646)
- feat: Add support for `.shift(n).over('col')` for pandas-like DataFrames (1627)


🐞 Bug fixes

- fix: pyspark group by with kwargs (1665)

📖 Documentation

- docs: use `IntoDataFrameT`/`IntoFrameT` in docs (1664)
- docs: Add return type description for more series namespace (1675)
- docs: Add more return type descriptions for Series (1674)
- docs: add return type descriptions for `cum_count`, `cum_max`, `cum_min`, `cum_prod`, `cum_sum` in Series (1673)
- docs: add return type descriptions to Series `arg_true`, `cast`, `clip`, `count` (1667)
- docs: Add return descriptions to Series's `abs`, `alias`, `all`, `any` methods for clarity (1653)

🛠️ Other improvements

- chore: pyarrow do not combine chunks (1662)
- chore: flatten `subset` in `unique` one level up (1671)
- test: add test for `nw.Expr|Series.str.contains` with `literal=True` (1670)
- test: check keys are in the same order in assert_equal_data (1668)
- ci: improve publish ci to use env vars (1652)
- chore: use `__narwhals_namespace__` more (1658)
- ci: split `dev` from `extra` (1655)

Thank you to all our contributors for making this release possible!
AlessandroMiola, ClaudioSalvatoreArcidiacono, Dhanunjaya-Elluri, FBruzzesi, MarcoGorelli and luke396

Changes

🚀 Performance improvements

- perf: avoid merge in pandas groupby (1638)

✨ Enhancements

- feat: add collect schema to interchange dfs (1646)
- feat: support std and var with ddof !=1 in pandas-like group by (1645)
- feat: add `DataFrame` and `LazyFrame` `explode` method (1542)

🐞 Bug fixes

- fix: Make compatible with latest cuDF release (1640)

📖 Documentation

- docs: Note that `maintains_order` has no effect (but keep around for backwards-compatibility) (1643)
- docs: fix typing example (1637)
- docs: Use relative paths (1636)
- docs: Remove warnings when building docs (1631)
- docs: returns and arguments documentation for lazyframe class (1630)
- docs: null handling (1624)

🛠️ Other improvements

- chore: Update pyproject.toml (1642)
- chore: register kwargs for `CompliantExpr` (1614)
- fix: exclude protocols in api completeness script (1635)
- test: not-so-old-versions, pretty-old-versions, nightlies (1626)

Thank you to all our contributors for making this release possible!
AlessandroMiola, DeaMariaLeon, Dhanunjaya-Elluri, FBruzzesi, MarcoGorelli, marenwestermann and marvinl803

Changes

🚀 Performance improvements

- perf: streamline pyarrow and pandas group by agg (1621)

✨ Enhancements

- feat: add `Series|Expr.rolling_var` and `Series|Expr.rolling_std` (1451)
- fix: Add support for pandas cumulative operations with over (1565)
- feat: add `var` to `Expr` and `Series` (1603)

🐞 Bug fixes

- fix: `nw.col('a').is_in(df['b'])` was raising (1616)
- fix: pandas and pyarrow were raising for repeated aggregations involving the same root name and the same aggregation function (1613)

📖 Documentation

- docs: more args and returns documentation in DataFrame class (1600)
- docs: make docstring examples function names more descriptive in functions.py (1602)
- docs: improve `DataFrame`, `LazyFrame` and `Series` docstrings (1622)

🛠️ Other improvements

- ci: unpin scikit-learn in scikit-lego test (1611)
- ci: Speed up tests in local development (1608)
- test: downstream test for tea-tasting (1605)
- test: minimum versions (1617)

Thank you to all our contributors for making this release possible!
ClaudioSalvatoreArcidiacono, DeaMariaLeon, Dhanunjaya-Elluri, FBruzzesi, Machele-codez, MarcoGorelli, e10v, marenwestermann and skritsotalakis