Python Polars 0.16.7

🚀 Performance improvements

• add arr.count_match expression and optimize arr.sum for List<Boolean> (#7023)
• optimize selection_to_pyexpr_list (#7020)
• avoid unnecessary function calls in LazyFrame.with_columns() (#7019)
• remove O^2 behavior in melt (#7003)
• Improve performance of expr_to_lit_or_expr for arguments of type Expr by ~80% (#6967)
• improve vec_hash perf for boolean and utf8 (#6963)
• don't pack utf8 columns in grouptuples ~5-15% (#6959)
• don't pack integer keys in determining ~8-18% group tuples. (#6956)
• use fxhash for all integers (#6954)

✨ Enhancements

• add arr.count_match expression and optimize arr.sum for List<Boolean> (#7023)
• add sort for struct dtype (#7021)
• More ergonomic coalesce args (#6989)
• raise informative error if invalid datetime_format passed to write_csv (#7005)
• Improve Series & Numpy arithmetic (#6983)
• More ergonomic agg args (#6982)
• rename parse_dates => try_parse_dates (#6987)
• remove packaging and/or distutils dependency with a minimal version parser utility (#6972)
• More ergonomic over args (#6986)
• add upper_bound and lower_bound methods to Series (#6990)
• More ergonomic col args (#6996)
• More ergonomic sort args (#6896)
• Make groupby agg shortcuts available in lazy (#6944)
• add map_dict method for Series (#6946)

🐞 Bug fixes

• reflect time zone conversion in lazy dataframe schema (#7022)
• ensure set_sorted never panics (#7013)
• fix struct append 0 sliced (#7012)
• fix dtype of diff for uint8 (#7010)
• fix coalesce supertype (#7000)
• if given, respect dtype time zone when instantiating pl.lit value (#6999)
• fix fill_null for categoricals (#6998)
• dtype of pow function (#6985)
• fix is_duplicated for utf8 dtype (#6997)
• Remove check for path to be non-directory if use_pyarrow (#6994)
• if given, respect dtype timeunit when instantiating pl.lit value (#6991)
• Add packaging to runtime dependencies (#6962)
• fix temporal logical types in pivot (#6957)
• typo in mean unit test - changed median -> mean (#6960)
• ensure literals are expanded in streaming (#6952)
• str.contains strict=False took no effect (#6950)

🛠️ Other improvements

• date-time unit tests refactor (#7002)
• test lit series arithmetic order (#7015)
• More test restructure (#6961)
• Properly deprecate .struct.to_frame (#6958)
• Properly deprecate GroupBy.agg_list (#6943)

Thank you to all our contributors for making this release possible!
@MarcoGorelli, @MatveyF, @alexander-beedie, @jakob-keller, @mslapek, @ozgrakkurt, @papparapa, @ritchie46, @sorhawell, @stinodego, @xhochy and @zundertj

Python Polars 0.16.6

✨ Enhancements

• add is_duplicated/is_unique for struct dtype (#6940)
• add is_between method for Series (#6933)
• supported nested fixedsizebinary conversion (#6923)
• raise error on invalid aggregation expressions (#6921)
• provide better errors when failing to read CSV data from buffers that have advanced their read position (#6920)
• truncate file path on error msg (#6917)
• Parse JSON data in Utf8 to polars dtype (#6885)
• More ergonomic groupby args (#6872)

🐞 Bug fixes

• object to_dict (#6931)
• respect maintain_order in groupby.apply (#6926)
• add special fast path for elementwise expression o… (#6924)
• fix anonymous list builder (#6916)
• reject multithreading on excessive ',\n' fields (#6906)
• fix regression with date => object typing in to_pandas method (#6902)
• dispatch suffix to asof_join by (#6899)
• improve recursive casting of nested data (#6897)
• don't fast explode on null introducing take (#6890)
• prevent external modules found on PYTHONPATH from bleeding into polars venv (#6888)
• prevent conflation of unit.io tests directory with python io module (#6889)

🛠️ Other improvements

• Bump ruff version (#6936)
• add more nested construction tests (#6912)
• Update Cargo.lock (#6893)
• unify constructor logic when initialising from a sequence of dicts (#6887)
• prevent conflation of unit.io tests directory with python io module (#6889)
• refactor datelike as temporal, and support Time dtype in Series.to_numpy (#6881)
• Consistently parse column name inputs (#6879)
• Use Self type more consistently (#6882)

Thank you to all our contributors for making this release possible!
@MarcoGorelli, @adamgreg, @alexander-beedie, @josh, @jvdd, @ritchie46 and @stinodego

Python Polars 0.16.5

🚀 Performance improvements

• speedup quantile/median ~2x (#6861)
• remove unneeded series allocations in groupby aggs (#6855)

✨ Enhancements

• restore dataframe class (#6869)
• add include_index option on init from pandas frames (#6847)
• properly implement null array (#6817)
• avoid panic error in strftime with invalid format (#6810)

🐞 Bug fixes

• fix crash in write_csv when mixed tz-naive and tz-aware datetimes are present (#6828)
• accept more types in groupby.agg (#6709)
• Fix pl.from_dataframe() as pyarrow.interchange was not i… (#6844)
• fix schema of functions: (#6845)
• stabilize integer operation to minimal required dtype (#6841)
• use explicit type-arg for PythonDataType (#6481)
• fix numpy/datetime regression (#6835)
• implement to_list for null dtype (#6834)
• Raise ValueError on passing multiple expressions Numpy ufunc (#6821)
• respect schema in ndjson (#6819)

🛠️ Other improvements

• Fail tests on warning (#6868)
• further improve struct expr docstrings (#6852)
• Deprecate non-keyword args for some functions (#6851)
• un-skip passing test (#6854)
• parenthesise col type signature to improve hint interaction with PyCharm (#6850)
• Deprecate positional join args (#6826)
• Rename argsort/argsort_by to arg_sort/arg_sort_by (#6829)
• Update dprint config excludes (#6822)
• Fix some broken noqa comments (#6823)
• Run mypy as part of the lint workflow (#6820)
• various minor docstring rendering fixes (#6818)
• fix lazy groupby docstring/rendering (#6816)

Thank you to all our contributors for making this release possible!
@MarcoGorelli, @alexander-beedie, @ghuls, @josh, @kngwyu, @oysols, @ritchie46, @stinodego and @zundertj

Python Polars 0.16.4

🚀 Performance improvements

• remove PySequence downcast (#6803)
• optimize arg_min/arg_max (#6799)

✨ Enhancements

• boolean Series broadcast comparison (eq/neq) against scalar True/False (#6797)

🐞 Bug fixes

• ensure join frame types are consistent (#6798)
• enable empty DataFrame (and Series) init from List of Structs/Lists schema/dtype (#6795)

Thank you to all our contributors for making this release possible!
@alexander-beedie, @igmriegel and @ritchie46

Rust Polars 0.27.0

🏆 Highlights

• Formalize list aggregation difference between groupbys, selection and window functions (#6487)

⚠️ Breaking changes

• error on string <-> date cmp (#6498)
• Formalize list aggregation difference between groupbys, selection and window functions (#6487)
• show where error messages originated (#6482)
• str.strip with multiple chars (#5929)

🚀 Performance improvements

• update string replacement codepaths following new benchmarking (#6777)
• improve dynamic groupby performance on sorted keys (#6599)
• faster frame-init from list of dicts (when omitting fields), and ensure fields are read according to the declared schema (#6472)
• Improve rechunk check (#6268)
• reuse allocated scratches in ipc writer (#6287)
• use dedicated writer thread for sink_parquet (#6285)
• first check rev-map on categorical equality check (#6085)
• ensure set_at_idx is O(1) (#5977)
• use iterator instead of loop polars_io::csv::parser::skip_condition (#5157)

✨ Enhancements

• accept separator for pivot and to_dummies (#6780)
• feat(rust, python) rename 'tz' to 'time_zone' in convert_time_zone and replace_time_zone (#6784)
• rename with_time_zone to convert_time_zone and cast_time_zone to replace_time_zone (#6768)
• support timezone in csv writer (#6722)
• implement series abstractions for Int128Type (#6679)
• parse timezone from Datetime (#6766)
• formally support duration division (#6758)
• add argmin/max for utf8 data (#6746)
• Support an ignore_nulls param for EWM calculations. (#5749) (#6742)
• deprecate tz_localize (#6693)
• guarantee schema-stable col(dtype) selection (#6674)
• better-characterise NotFound exceptions (#6670)
• disallow with_time_zone from/to tz-naive (#6659)
• let cast_time_zone work on tz-naive and deprecate tz-localize (#6649)
• implement fill_null for list data (#6635)
• expression functions should be nullable (#6629)
• add streamable udfs (#6614)
• is_first for struct dtype (#6595)
• Added from_str_radix method to StringNameSpace that allows to parse strings from any base to i32 (#6570)
• improve predicate pushdown (#6579)
• raise error on invalid binary cmp (#6564)
• let cast_time_zone accept None (#6539)
• add utc parameter to strptime (#6496)
• add meta 'has_multiple_outputs', 'is_regex_projec… (#6500)
• error on string <-> date cmp (#6498)
• show where error messages originated (#6482)
• faster frame-init from list of dicts (when omitting fields), and ensure fields are read according to the declared schema (#6472)
• allow expr in str.contains (#6443)
• add float formatting option (#6432)
• allow expressions as arguments in str.ends_with (#6361)
• accept expr in str.starts_with (#6355)
• add strict parameter to decoding expressions (#6342)
• allow unordered struct creating from anyvalues (#6321)
• parse abbrev month name (#6314)
• add dt.combine for combining date and time components (#6121)
• add sink_ipc (#6286)
• ensure ooc sort works ooc with all-constant values (#6235)
• The 1 billion row sort (#6156)
• optionally treat missing UTF8 values as the empty string at CSV parse-time (#6203)
• When moving error out of LogicalPlan, leave behind String with error message instead of None (#6199)
• generalize the cloud storage builders (#5972)
• Implement DataFrame.unique(keep="none") (#6169)
• add arr.take expression (#6116)
• allow extend_constant to work with date literals (#6114)
• allow nested categorical cast (#6113)
• add a rounded_corners modifier to pl.Config.set_tbl_formatting (#6108)
• Get polars to compile to wasm target (#6050)
• add search_sorted for arrays and utf8 dtype (#6083)
• improve error message when writing nested data to… (#6040)
• updated default table format from "UTF8_FULL" to "UTF8_FULL_CONDENSED" (#5967)
• str.strip with multiple chars (#5929)
• support glob in parquet object_storage (#5928)
• read decimal as f64 (#5938)
• improve query plan scan formatting (#5937)
• allow all null cast (#5933)
• truncate by calendar weeks (#5759)
• merge sorted dataframes (#5817)
• impl hex and base64 for binary (#5892)
• streaming parquet from object_stores (#5871)

🐞 Bug fixes

• always rechunk if n_chunks > n_rows (#6786)
• fix ndjson empty array parsing (#6785)
• make some list expressions aware of groupby context (#6776)
• use explicit drop function node (#6769)
• don't set sorted flag if we reverse sort the left … (#6772)
• handle edge-case with string-literal replacement when the replace value looks like a capture group (#6765)
• respect skip_rows in glob parsing csv (#6754)
• Improve error message in DataFrame constructor (#6715)
• arrow map dtype conversion (#6732)
• dedicated rename implementation. (#6688)
• return correct display/repr names for NaN-related expressions (#6721)
• strftime with time zone directive (#6673)
• improve error message in date_range with invalid units (#6671)
• remove uses of rayon global thread pool (#6682)
• true-divide output type (#6665)
• fix(rust, python) cast to and from fixed offsets (#6602)
• raise error on string numeric arithmetic (#6601)
• partially assert sortedness in groupby dynamic (#6593)
• fix(rust, python); raise oob if negative index given to take (#6590)
• fix predicate pushdown key check (#6577)
• fix schema of apply with many inputs on empty df (#6571)
• let lhs determine struct order in supertype (#6572)
• fix(rust, python) validate utc, fmt, and tz-aware in strptime (#6550)
• add strptime to filter boundary (#6560)
• list eval all null array (#6545)
• implement ser/de for BinaryChunked (#6543)
• raise if tz_localize called on UTC-aware (#6526)
• make concat_list group aware (#6527)
• error on invalid expanding expression (#6521)
• create from dicts directly as struct categorical (#6520)
• fix oob in arr.get by expressions (#6519)
• fix cse schema (#6518)
• panic when max_len -1 is reached (#6494)
• Formalize list aggregation difference between groupbys, selection and window functions (#6487)
• fix(rust, python) validate tz in with_time_zone (#6417)
• faster frame-init from list of dicts (when omitting fields), and ensure fields are read according to the declared schema (#6472)
• use consistent floor division for floats/ints (#6460)
• split semi/anti join optimization (#6459)
• fix doc comment in ParallelStrategy (#6444)
• fix projection pushdown on double semi join (#6440)
• cumulative_eval ensure output dtype is respected (#6435)
• auto-detect %+ as tz-aware (#6434)
• correct error message in cast_time_zone (#6411)
• only use float simd on specific alignment (#6427)
• no early escape when window is equal to len in rolling_float (#6408)
• raise error on invalid sort_by argument (#6382)
• take offset into account with str.explode (#6384)
• Return empty batch for pl.read_csv_batched().next_… (#6381)
• implement ser/de for StructChunked (#6359)
• series of empty structs (#6347)
• don't cast nulls before trying normal cast (#6339)
• expand all nested wildcards in functions (#6334)
• fix groupby rolling by_key if groups are empty (#6333)
• parse abbrev month name (#6314)
• disallow alias in inline join expressions (#6312)
• feature flag "get_sink" ipc (#6306)
• block proj-pd and pred-pd on swapping rename (#6303)
• convert nested dictionary with i64 keys (#6299)
• fix panic dynamic_groupby on empty dataframe (#6294)
• Parse negative dates with polars parser (#6256)
• Add list inner dtype when printing Series (#6233)
• fix when then otherwise with arity and aggregation… (#6224)
• pass name to value counts in aggregation (#6221)
• don't set fast_explode on list of structs (#6220)
• explode of empty nullable list (#6190)
• fix empty streaming joins (#6149)
• fix streaming joins where the join order has been … (#6143)
• write tz-aware datetimes to csv (#6135)
• Print error message on mmap IPC file only in verbose mode (#6098)
• fix invalid dtype in chunked array after struct cast (#6093)
• don't run cse cache_states if no projections found (#6087)
• Update read_csv error message (#6082)
• propogate nulls in binary arithmetic/aggregation (#6076)
• deal with unnest schema expansion in projection pd (#6063)
• correct output dtype for cummin/cumsum/cummax (#6062)
• block streaming on literal series/range (#6058)
• ndjson struct inference (#6049)
• deal with empty structs (#6039)
• fix aggregation that filters out all data (#6036)
• fix diff overflow (#6033)
• keep column names in is_null/is_not_null (#6032)
• keep name when sorting categorical in lexial order (#6029)
• properly set null anyvalue if categorical is neste… (#6025)
• make weekday tz-aware (#5989)
• fix categorical in struct anyvalue issue (#5987)
• fix invalid boolean simplification (#5976)
• allow empty sort on any dtype (#5975)
• properly deal with categoricals in streaming queries (#5974)
• don't panic on ignored context (#5958)
• don't allow named expression in arr.eval (#5957)
• fix panic in join expressions (#5954)
• block ordered predicates before explode (#5951)
• adhere to schema in arr.eval of empty list (#5947)
• fix arrow nested null conversion (#5946)
• allow None in arr.slice length (#5934)
• fix time to duration cast (#5932)
• error on addition with datetime/time (#5931)
• don't create categoricals in streaming (#5926)
• object filter should keep single chunk (#5913)
• csv, read escaped "" as missing (#5912)
• fix pivot of signed integers (#5909)
• fix latest oob in streaming convertion (#5902)
• fix date + duration offsets outside of nanosecond datetime bounds (#5889)
• adapt k to len in topk (#5888)

🛠️ Other improvements

• propagate error in date_range with invalid time zone (#6759)
• update arrow to 0.16 (#6748)
• remove unreachable path in write_anyvalue (#6727)
• add groupby_dynamic to docs (#6725)
• chore(rust) disallow chunked d...

Python Polars 0.16.3

✨ Enhancements

• add update method to ldf/df (#6787)
• accept separator for pivot and to_dummies (#6780)
• feat(rust, python) rename 'tz' to 'time_zone' in convert_time_zone and replace_time_zone (#6784)
• Allow other expressions for default arg in map_dict (#6781)
• minor ergonomic affordance; allow pl.concat from generator expression (#6779)
• rename with_time_zone to convert_time_zone and cast_time_zone to replace_time_zone (#6768)
• Add map_dict expression. (#5899)
• support timezone in csv writer (#6722)
• default to 1d interval in date_range (#6771)
• parse timezone from Datetime (#6766)
• Add option to use PyArrow backed-extension arrays when … (#6756)
• formally support duration division (#6758)
• add argmin/max for utf8 data (#6746)
• Improve numpy support: conversion of numpy arrays with … (#6738)
• Improved assert equal messages (#6737)
• Support an ignore_nulls param for EWM calculations. (#5749) (#6742)
• scan_ds predicate pushdown for string cmp (#6734)
• don't require pyarrow for utf8 -> numpy conversion (#6733)
• More ergonomic with_columns args (#6686)
• feat(python):Add return_as_string arg to DF.glimpse; default=False (#6678)
• better-characterise NotFound exceptions (#6670)
• disallow with_time_zone from/to tz-naive (#6659)
• More ergonomic select args (#6667)
• let cast_time_zone work on tz-naive and deprecate tz-localize (#6649)
• improved exceptions on attempt to use invalid schema/dtypes (#6653)

🐞 Bug fixes

• always rechunk if n_chunks > n_rows (#6786)
• fix ndjson empty array parsing (#6785)
• make some list expressions aware of groupby context (#6776)
• use explicit drop function node (#6769)
• don't set sorted flag if we reverse sort the left … (#6772)
• handle edge-case with string-literal replacement when the replace value looks like a capture group (#6765)
• respect skip_rows in glob parsing csv (#6754)
• Improve error message in DataFrame constructor (#6715)
• arrow map dtype conversion (#6732)
• respect 'None' in from_dicts (#6726)
• dedicated rename implementation. (#6688)
• return correct display/repr names for NaN-related expressions (#6721)
• strftime with time zone directive (#6673)
• typing for Series methods that can return None (#6690)
• ensure that iter_rows always returns all values from all chunks/batches in accelerated codepath (#6708)
• Support numpy ufunc when expression not first arg (#6675)
• Raise ValueError on adding float to Series of dtype date (#6677)
• remove uses of rayon global thread pool (#6682)
• true-divide output type (#6665)
• improve behaviour of dict-expansion (scalars) when mixed with numpy arrays (#6663)
• Preserve Expr name in is_between (#6661)
• Tiny improvement of Field repr (#6640)

🛠️ Other improvements

• Update mypy to version 1.0.0 (#6744)
• integrate ignore_nulls into EWM parametric tests (#6751)
• redirect tz_localize (#6749)
• Reorganize benchmark test folder (#6695)
• Split long test modules (namespaces) (#6668)
• Use pytest marker for slow tests (#6642)
• unify nan_to_null and nan_to_none parameter names, expose to DataFrame init, add test coverage (#6637)
• update extend_constant docs/typing (and test coverage) (#6646)

Thank you to all our contributors for making this release possible!
@AnatolyBuga, @MarcoGorelli, @MatveyF, @alexander-beedie, @ghuls, @jgmartin, @phaile2, @plaflamme, @ritchie46, @sorhawell, @stinodego, @yuntai and @zundertj

Python Polars 0.16.2

🚀 Performance improvements

• improve dynamic groupby performance on sorted keys (#6599)

✨ Enhancements

• implement fill_null for list data (#6635)
• expression functions should be nullable (#6629)
• Implement unary plus operation on exprs and series (#6517)
• add streamable udfs (#6614)
• is_first for struct dtype (#6595)
• Added from_str_radix method to StringNameSpace that allows to parse strings from any base to i32 (#6570)
• Implement DataFrame Interchange Protocol through pyarrow (#6581)
• improve predicate pushdown (#6579)
• raise error on invalid binary cmp (#6564)

🐞 Bug fixes

• make string_repr private (#6636)
• treat literal values consistently in select context, improve related typing (#6628)
• Fix _repr_html_ double-height rows (#5645) (#6534)
• fix(rust, python) cast to and from fixed offsets (#6602)
• raise error on string numeric arithmetic (#6601)
• don't convert "ns"-precision temporal types via pyarrow (#6592)
• partially assert sortedness in groupby dynamic (#6593)
• fix(rust, python); raise oob if negative index given to take (#6590)
• fix predicate pushdown key check (#6577)
• fix schema of apply with many inputs on empty df (#6571)
• let lhs determine struct order in supertype (#6572)
• ensure consistent handling of 1D numpy arrays with respect to other sequences (#6569)
• fix(rust, python) validate utc, fmt, and tz-aware in strptime (#6550)
• add strptime to filter boundary (#6560)

🛠️ Other improvements

• make string_repr private (#6636)
• add example of using is_between with string bounds, and extend test coverage for the same (#6627)
• provide additional examples for diff methods (#6630)
• Consistent handling of env vars (#6626)
• make structify behaviour experimental, while also extending it to aliased expressions (#6615)
• Disallow clippy borrow deref ref (#6605)
• Update ruff version and some settings (#6588)
• Add release flow info to contributing guide (#6480)
• Use assert_series_equal instead of s.series_equal(...) (#6582)
• cleanup last vestiges of experimental kwargs setting (#6568)
• Use assert_frame_equal instead of assert df.frame_equal(...) (#6553)
• Update to PyO3 to 0.18.0 (#6531)

Thank you to all our contributors for making this release possible!
@2-5, @MarcoGorelli, @abalkin, @alexander-beedie, @cojmeister, @dependabot, @dependabot[bot], @jjerphan, @plaflamme, @ritchie46 and @stinodego

Python Polars 0.16.1

🏆 Highlights

• Formalize list aggregation difference between groupbys, selection and window functions (#6487)
• automagically upconvert with_columns kwarg expressions with multiple output names to struct; extend **named_kwargs support to select (#6497)

⚠️ Breaking changes

• error on string <-> date cmp (#6498)
• Formalize list aggregation difference between groupbys, selection and window functions (#6487)
• show where error messages originated (#6482)
• Remove deprecated paths from Series.__getitem__ (#6048)
• change behaviour of named rows (#6302)
• Remove deprecated read/write_json arguments (#5990)
• make schema, schema_overrides, and orient consistent on all user-facing interfaces (#6387)
• Groupby iteration now returns tuples of (name, data) (#6350)
• Remove Groupby.pivot (#6016)
• Remove deprecated argument aliases (#5993)
• Change Series.shuffle default behaviour (#5991)
• Change Expr.is_between default behaviour (#5985)
• Restrict certain function parameters to be keyword-only (#6464)

✨ Enhancements

• let cast_time_zone accept None (#6539)
• automagically upconvert with_columns kwarg expressions with multiple output names to struct; extend **named_kwargs support to select (#6497)
• add some missing type annotation in series dispatch methods (#6523)
• better errors in get_ptr and a probability on a boolean… (#6522)
• add utc parameter to strptime (#6496)
• add meta 'has_multiple_outputs', 'is_regex_projec… (#6500)
• error on string <-> date cmp (#6498)
• ~30% faster iter_rows(named=True) and to_dicts(), if pyarrow available (#6493)
• show where error messages originated (#6482)
• Remove deprecated paths from Series.__getitem__ (#6048)
• change behaviour of named rows (#6302)
• Remove deprecated read/write_json arguments (#5990)
• Groupby iteration now returns tuples of (name, data) (#6350)
• Remove Groupby.pivot (#6016)
• Remove deprecated argument aliases (#5993)
• Change Series.shuffle default behaviour (#5991)
• Change Expr.is_between default behaviour (#5985)
• Restrict certain function parameters to be keyword-only (#6464)

🐞 Bug fixes

• implement ser/de for BinaryChunked (#6543)
• on frame-init from generator, initial chunk_size cannot be smaller than infer_schema_length (#6541)
• raise if tz_localize called on UTC-aware (#6526)
• make concat_list group aware (#6527)
• error on invalid expanding expression (#6521)
• create from dicts directly as struct categorical (#6520)
• fix oob in arr.get by expressions (#6519)
• fix cse schema (#6518)
• panic when max_len -1 is reached (#6494)
• Formalize list aggregation difference between groupbys, selection and window functions (#6487)
• fix(rust, python) validate tz in with_time_zone (#6417)

🛠️ Other improvements

• Remove verify_series_and_expr_api util (#6524)
• Disable some tests for Windows (#6532)
• Remove unnecessary brackets in doc examples (#6332)
• Enable some tests for Windows (#6511)
• Fix test issue with tmp directory (#6508)
• Fix some deprecation warnings (#6495)
• added all missing examples for temporal expressions (#6488)
• Utilize pytest-xdist for faster unittests (#6483)
• test(python) I/O test improvements (#6475)
• make schema, schema_overrides, and orient consistent on all user-facing interfaces (#6387)
• improved error message from Expr on incorrect usage in boolean context (#6473)

Thank you to all our contributors for making this release possible!
@MarcoGorelli, @alexander-beedie, @gab23r, @papparapa, @ritchie46, @romanovacca, @stinodego and @zundertj

Python Polars 0.15.18

✨ Enhancements

• More precise pipe type annotation (#6457)

🐞 Bug fixes

• use consistent floor division for floats/ints (#6460)
• split semi/anti join optimization (#6459)

🛠️ Other improvements

• Specify deltalake minimum version (#6363)
• deprecate iterrows in favour of iter_rows, add new @redirect class decorator (#6461)
• Improve IO test structure (#6453)

Thank you to all our contributors for making this release possible!
@alexander-beedie, @josh, @ritchie46 and @stinodego

Python Polars 0.15.17

✨ Enhancements

• allow expr in str.contains (#6443)
• Deprecate with_column (#6128)
• expose efficient iterator over DataFrame slices (#6414)
• add float formatting option (#6432)
• 10% speedup for to_dicts method (#6415)
• add datetime/duration dtype selector groups covering the different timeunits (#6425)
• allow internal api to get pointer to values buffer (#6385)
• infer ISO8601 datetimes (#6357)
• minor improvement to auto-detection of ambiguous data orientation (#6376)
• allow expressions as arguments in str.ends_with (#6361)
• Make groupby rolling/dynamic iterable (#6372)
• accept expr in str.starts_with (#6355)
• Move explode to namespaces (#6351)
• Rename Series.struct.to_frame to .struct.unnest (#6352)
• auto-detect %+ as tz-aware (#6434)

🐞 Bug fixes

• fix projection pushdown on double semi join (#6440)
• ensure column-exclusion works with the new dtype groups, and improve some related typing (#6442)
• ensure from_dicts and DataFrame init from list of dicts behave consistently, update/improve related docstrings (#6431)
• cumulative_eval ensure output dtype is respected (#6435)
• allow from pandas null structs (#6430)
• fixed interaction of schema_overrides with frame-init from list of dicts (#6424)
• only use float simd on specific alignment (#6427)
• no early escape when window is equal to len in rolling_float (#6408)
• is_between typing with time in start and end (#6393)
• dont incorrectly infer Zulu time (#6378)
• raise error on invalid sort_by argument (#6382)
• take offset into account with str.explode (#6384)
• Return empty batch for pl.read_csv_batched().next_… (#6381)
• ensure pyarrow.compute module is loaded (#6353)
• implement ser/de for StructChunked (#6359)
• series of empty structs (#6347)

🛠️ Other improvements

• add explicit note about use of Config as a context manager (#6439)
• ensure from_dicts and DataFrame init from list of dicts behave consistently, update/improve related docstrings (#6431)
• Fix docstring of series.interpolate (#6399)
• Remove duplicate test (#6390)
• deprecate columns param for DataFrame init; transitioning to schema (#6366)
• Add docs and tests to Expr.flatten (#6370)
• Example of filtering partitioned delta tables (#6365)
• Uppercase project URL refs (#6362)

Thank you to all our contributors for making this release possible!
@ChayimFriedman2, @MarcoGorelli, @alexander-beedie, @c-peters, @flowlight0, @gab23r, @gam-phon, @ghuls, @jgmartin, @josh, @ritchie46, @romanovacca, @stinodego, @universalmind303 and @zundertj