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Python Polars 0.17.3

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@github-actions github-actions released this 15 Apr 18:45
· 3958 commits to refs/heads/main since this release
4ffcb74

🏆 Highlights

  • support DataFrame init from pydantic model data (#8178)

🚀 Performance improvements

  • fail fast on non-inferable strings in strptime if no fmt is provided (#8111)
  • make chunks search more resilient (#8229)
  • SIMD accelerated arg_min/arg_max (via argminmax) (#8074)
  • speed up csv parsing for slower datetimes formats (#8213)
  • improve datetime interpret perf (#8209)
  • arr.eval run on groupby expression engine when possible (#8199)
  • ~2-3x speedup for DataFrame init from pydantic models (#8181)

✨ Enhancements

  • add use_earliest argument to replace_time_zone for dealing with ambiguous datetimes (#8087)
  • fail loudly on .%f directive, as it differs from the Python standard library (#8237)
  • SQL CTE's (#8208)
  • automatically convert series OP expr -> pl.lit(series) OP expr where OP is arithmetic (#8225)
  • add pickle support for LazyFrame (#8220)
  • add duration cumsum and remainder (#8219)
  • support DataFrame init from nested dataclass, pydantic, and NamedTuple objects (#8185)
  • better algorithm for streaming unique (#8003)
  • Add approx distinct count via approx_unique() (#7937)
  • add percentiles to describe methods (#8169)
  • support DataFrame init from pydantic model data (#8178)
  • display skipped row if same number of rows (#8170)

🐞 Bug fixes

  • add special numpy float branch in anyvalue conversion (#8259)
  • fix boolean par materialization (#8257)
  • improve null/empty list construction (#8255)
  • fix offsets in parallel utf8 materialization (#8254)
  • nested struct logical type consistency (#8249)
  • keep literal state if elementwise function is applied (#8195)
  • decimal ensure backed arrow arrays have correct dtype (#8193)

🛠️ Other improvements

  • parametric/hypothesis testing code cleanups (#8253)
  • Rename strptime/strftime args (#8221)
  • change sampling ratio for groupby strategy (#8223)
  • Rename Expr.list to implode (#8165)
  • don't panic on err in offset_by (#8210)
  • re-enable test parallization for Windows tests (#8214)
  • Fix small typo: "im memory" -> "in memory" (#8187)
  • remove unused dtype_to_arrow_type (#8177)

Thank you to all our contributors for making this release possible!
@MarcoGorelli, @alexander-beedie, @avimallu, @borchero, @chitralverma, @clickingbuttons, @ghuls, @josh, @jvdd, @rben01, @ritchie46, @stinodego and @universalmind303