Published April 22, 2026 | Version py-1.40.1
Software Open

pola-rs/polars: Python Polars 1.40.1

Authors/Creators

  • 1. Polars
  • 2. PhD Candidate, Radboud University
  • 3. Quansight
  • 4. @aertslab
  • 5. @pola-rs
  • 6. @Quantco
  • 7. University of California, Berkeley

Description

🚀 Performance improvements

  • Skip validity mask processing in __array_ufunc__ when no inputs have nulls (#27358)

✨ Enhancements

  • Cargo deny (#27363)
  • Add maintain_order parameter to merge_sorted (#27263)

🐞 Bug fixes

  • Honor having predicate in GroupBy iter (#27370)
  • Use the physical dtype for NumUnorderedImplodeReducer arrow ListArray (#27375)
  • Address bug in reduce_balanced for certain input length lists affecting pl.concat (#27352)
  • Ensure list.sample() allows fraction > 1 when with_replacement=True (#27350)
  • Ensure append() errors when upcast=False (#27346)
  • Always rechunk sorts, prune sorts even in eager execution (#27356)
  • Fix typing for DataFrame.__init__ and Series.__init__ so they don't require all optional dependencies to be installed (#27348)

📖 Documentation

  • Split out openlineage docs into guide and configuration (#27371)
  • Add explanation on the observatory sqlite db file (#27354)

🛠️ Other improvements

  • Disable mypy type checking for pyarrow calls (#27377)
  • Disable debug symbols in macos coverage tests (#27361)
  • Cargo deny (#27363)

Thank you to all our contributors for making this release possible! @EndPositive, @Kevin-Patyk, @MarcoGorelli, @carnarez, @dsprenkels, @gab23r, @jonathanchang31, @kdn36, @mzjp2 and @ritchie46

Files

pola-rs/polars-py-1.40.1.zip

Files (6.9 MB)

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Additional details

Related works

Is supplement to
Software: https://github.com/pola-rs/polars/tree/py-1.40.1 (URL)

Software

Repository URL
https://github.com/pola-rs/polars