22 Pull requests merged by 13 people

• BUG: groupby.agg with UDF changing pyarrow dtypes

  #59601 merged Jul 29, 2025

• MNT: simplify cibuildwheel configuration

  #61984 merged Jul 28, 2025

• Bump pypa/cibuildwheel from 2.23.3 to 3.1.1

  #61981 merged Jul 28, 2025

• TST: add test for dtype argument in str.decode

  #61872 merged Jul 28, 2025

• DOC: update .str.contains/match/startswith docstring examples for default behaviour

  #61960 merged Jul 28, 2025

• BUG: Series.replace with CoW when made from an Index

  #61972 merged Jul 28, 2025

• BUG: Fix infer_dtype result for complex with pd.NA

  #61977 merged Jul 28, 2025

• DOC: Update documentation for using natural sort with sort_values

  #61979 merged Jul 28, 2025

• [backport 2.3.x] Output formatting: preserve quoting for string categories (#61891)

  #61966 merged Jul 26, 2025

• [backport 2.3.x] BUG: fix to_json() with JSON Table Schema work correctly with string dtype (#61900)

  #61965 merged Jul 26, 2025

• CI: enable doctest errors again + fixup categorical examples

  #61947 merged Jul 26, 2025

• Backport PR #61921 on branch 2.3.x (DOC: explicitly mention new str dtype is no longer a numpy dtype in migration guide)

  #61961 merged Jul 26, 2025

• BUG: fix to_json() with JSON Table Schema work correctly with string dtype

  #61900 merged Jul 26, 2025

• Backport PR #61958 on branch 2.3.x (DOC: Add release notes template for 2.3.2)

  #61959 merged Jul 26, 2025

• DOC: explicitly mention new str dtype is no longer a numpy dtype in migration guide

  #61921 merged Jul 26, 2025

• DOC: Add release notes template for 2.3.2

  #61958 merged Jul 26, 2025

• DOC: Add tzdata to README dependencies list

  #61931 merged Jul 25, 2025

• DOC: fix doctests for pandas/core/strings/accessor.py for new string dtype

  #61908 merged Jul 25, 2025

• Output formatting: preserve quoting for string categories

  #61891 merged Jul 25, 2025

• Backport PR #61933 on branch 2.3.x (unpin scipy since statsmodels was fixed)

  #61934 merged Jul 24, 2025

• unpin scipy since statsmodels was fixed

  #61933 merged Jul 24, 2025

• DOC: fix doctests for pandas/core/base.py for new string dtype

  #61905 merged Jul 22, 2025

18 Pull requests opened by 12 people

• BUG: Add min/max methods to ArrowExtensionArray GH#61311

  #61924 opened Jul 22, 2025

• CoW: add readonly flag to ExtensionArrays, return read-only EA/ndarray in .array/EA.to_numpy()

  #61925 opened Jul 22, 2025

• Updating error message to include more details about dataframe

  #61929 opened Jul 23, 2025

• BUG: Fix TypeError in assert_index_equal when comparing CategoricalIndex with check_categorical=True and exact=False

  #61941 opened Jul 24, 2025

• BUG: Fix Series.str.contains with compiled regex on Arrow string dtype (#61942)

  #61946 opened Jul 25, 2025

• TST: run python-dev CI on 3.14-dev

  #61950 opened Jul 25, 2025

• DOC: added button to edit on GitHub

  #61956 opened Jul 26, 2025

• Flattened footer

  #61957 opened Jul 26, 2025

• BUG: fix .str.isdigit to honor unicode superscript for older pyarrow

  #61962 opened Jul 26, 2025

• [backport 2.3.x] BUG: fix fill value for gouped sum in case of unobserved categories for string dtype (empty string instead of 0) (#61909)

  #61963 opened Jul 26, 2025

• BUG FIX: Using Series.str.fullmatch() and Series.str.match() with a compiled regex fails with arrow strings

  #61964 opened Jul 26, 2025

• ENH: usecols takes input order for read_csv implementation review

  #61967 opened Jul 26, 2025

• BUG: Fix Series.reindex losing values when reindexing to MultiIndex

  #61969 opened Jul 26, 2025

• DOC: rephrase CoW ChainedAssignmentError message now CoW is always enabled

  #61970 opened Jul 27, 2025

• API: offsets.Day is always calendar-day

  #61985 opened Jul 28, 2025

• Fix warning for extra fields in read_csv with on_bad_lines callable

  #61987 opened Jul 29, 2025

• BUG: NotImplemented for non-1D BooleanArray ops; add numeric EA shape error tests

  #61990 opened Jul 29, 2025

• BUG/DEPR: logical operation with bool and string

  #61995 opened Jul 29, 2025

23 Issues closed by 6 people

• PERF: `pandas.DataFrame.stack` with `future_stack=True`

  #61994 closed Jul 29, 2025

• BUG: Groupby aggregate coersion of outputs inconsistency for pyarrow dtypes

  #61636 closed Jul 29, 2025

• BUG: Groupby-aggregate on a boolean column returns a different datatype with pyarrow than with numpy

  #53030 closed Jul 29, 2025

• DOC: Improve docstrings in utility functions in pandas/core/common.py (lines 176–210)

  #61986 closed Jul 29, 2025

• BUG: CoW - eq not implemented for <class 'pandas.core.internals.blocks.ExtensionBlock'>

  #61622 closed Jul 28, 2025

• BUG: infer_dtype returns "mixed" for complex and pd.NA mix

  #61976 closed Jul 28, 2025

• RLS: 2.3.1

  #61590 closed Jul 28, 2025

• DOC: code coverage app provided in documentation is invalid

  #61968 closed Jul 27, 2025

• ENH: astype(object) does not convert numpy strings to str

  #60496 closed Jul 26, 2025

• DOC: fix doctests for repr changes with the new string dtype

  #61886 closed Jul 26, 2025

• BUG: make to_json with JSON Table Schema work correctly with string dtype

  #61889 closed Jul 26, 2025

• BUG: Cannot interpret string dtype as a valid data type

  #61915 closed Jul 26, 2025

• BUG: Replacement fails after NA value with PyArrow-backed strings

  #61948 closed Jul 25, 2025

• DOC: Add tzdata to dependencies section in README

  #61927 closed Jul 25, 2025

• BUG: Unexpected Code Segment Executed, Causing Logical Error

  #61932 closed Jul 24, 2025

• BUG: In master, math with periodindex + index of offset produces wrong result

  #50162 closed Jul 23, 2025

• ENH: read_parquet as a class method

  #58303 closed Jul 23, 2025

• BUG: 'Engine' object has no attribute 'cursor'

  #60124 closed Jul 23, 2025

• BUG: Pandas to_sql 'Engine' object has no attribute 'cursor'

  #60684 closed Jul 23, 2025

• BUG: why arrow no affect in Intel chips？

  #60466 closed Jul 23, 2025

• BUG: Cannot connect to odoo

  #60800 closed Jul 23, 2025

• BUG: DataFrame.mul() corrupts data by setting values to zero

  #61687 closed Jul 23, 2025

• BUG: `date_range` gives different output ends for fixed `end` and varying `start` when `freq="B"`

  #61922 closed Jul 22, 2025

22 Issues opened by 18 people

• BUG: Inconsistent `datetime` dtype based on how the dataframe gets initialized

  #61993 opened Jul 29, 2025

• DOC: Point out difference in usage of "str" dtype in constructor and astype member

  #61992 opened Jul 29, 2025

• BUG: Atribute Error when running as non-superuser

  #61991 opened Jul 29, 2025

• BUG: Boolean Column Indexing Issue in Pandas

  #61980 opened Jul 28, 2025

• ENH: Function‑scoped bad‑line callback for read_csv that provides line_number (immediate per‑row handling without global side‑effects)

  #61978 opened Jul 27, 2025

• BUG: 'Sphinx parallel build error' when building docs locally prevents index.html creation

  #61975 opened Jul 27, 2025

• BUG: The lines skipped by pd.read_csv(path, chunksize=n, on_bad_lines='skip') depends on `n`.

  #61973 opened Jul 27, 2025

• DOC: shift argument in `Series.shift()` is not used

  #61955 opened Jul 25, 2025

• BUG: Using `Series.str.fullmatch()` and `Series.str.match()` with a compiled regex fails with arrow strings

  #61952 opened Jul 25, 2025

• BUG: Implicit upcast to float64 for large series (more than 1000000 rows)

  #61951 opened Jul 25, 2025

• BUG: border attribute used in html.py was deprecated in HTML5

  #61949 opened Jul 25, 2025

• DOC: Standardize noncompliant docstrings in pandas/io/html.py (flake8-docstrings)

  #61944 opened Jul 25, 2025

• BUG: series.groupby(level=0) and series.groupby(pd.Grouper(level=0)) produce different orders

  #61943 opened Jul 25, 2025

• BUG: Using `Series.str.contains()` with a compiled regex and arrow strings fails

  #61942 opened Jul 24, 2025

• BUG: Using `/` operator with a `Path` and `Series` of string dtype fails

  #61940 opened Jul 24, 2025

• DOC: Docstring for BooleanDType inconsistent with the rest of repo

  #61939 opened Jul 24, 2025

• BUG: `metadata` on `np.ndarray` of `np.dtype("O")` dtype lost when roundtripped through `pandas.Series`

  #61938 opened Jul 24, 2025

• BUG: `Index` accepts lists as values

  #61937 opened Jul 24, 2025

• BUG: `assert_index_equal(CategoricalIndex, CategoricalIndex, check_categorical=True, exact=False)` raises TypeError instead of AssertionError

  #61935 opened Jul 24, 2025

• PERF: `DataFrame.copy(deep=True)` returns a view on the original pyarrow buffer

  #61930 opened Jul 23, 2025

• indexing with a `Categorical` of `Interval`s is inefficient

  #61928 opened Jul 23, 2025

• BUG: Merge fails on pyarrow datetime columns

  #61926 opened Jul 23, 2025

63 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• ENH: Added `DataFrame.nsorted` to select top ``n`` rows according to column-dependent order

  #61457 commented on Jul 23, 2025 • 3 new comments

• POC: consistent NaN treatment for pyarrow dtypes

  #61732 commented on Jul 23, 2025 • 2 new comments

• ENH: Implement PDEP-17

  #61468 commented on Jul 27, 2025 • 1 new comment

• DOC: Clarify broadcasting behavior when using lists in DataFrame arithmetic (GH18857)

  #61820 commented on Jul 23, 2025 • 1 new comment

• DOC: Document that str.match accepts a regular expression

  #61879 commented on Jul 26, 2025 • 1 new comment

• BUG: IntervalIndex.unique() only contains the first interval if all interval borders are negative

  #61920 commented on Jul 24, 2025 • 1 new comment

• BUG: replace value failed

  #61643 commented on Jul 22, 2025 • 0 new comments

• API: Breaking Changes in 3.0 (without deprecations)

  #44823 commented on Jul 28, 2025 • 0 new comments

• ENH: Allow storing timezone-aware datetimes in a series with a datetime64 dtype

  #46998 commented on Jul 28, 2025 • 0 new comments

• DOC: Enforce Numpy Docstring Validation (Parent Issue)

  #58063 commented on Jul 28, 2025 • 0 new comments

• BUG: pandas.Index takes multidimensional array as input

  #20285 commented on Jul 29, 2025 • 0 new comments

• BUILD: Installation issue on Mac with M1 Pro arm64 processor. pandas_parser.cpython-311-darwin.so is using x86_64 arch

  #61566 commented on Jul 29, 2025 • 0 new comments

• ENH: ExcelWriter append or create mode

  #61634 commented on Jul 29, 2025 • 0 new comments

• DOC: Reindexing behaviour of dataframe column-assignment missing

  #39845 commented on Jul 29, 2025 • 0 new comments

• Thousands separator for to_csv

  #30045 commented on Jul 29, 2025 • 0 new comments

• BUG: Dataframe.aggregate drops pyarrow backend for lambda aggregation functions

  #61812 commented on Jul 29, 2025 • 0 new comments

• API: make Day preserve time-of-day across DST transitions

  #55502 commented on Jul 28, 2025 • 0 new comments

• BUG: Add fillna at the beginning of _where not to fill NA. #60729

  #60772 commented on Jul 24, 2025 • 0 new comments

• Fix alignment in Series subtraction with MultiIndex, Index and NaN values (#60908)

  #61381 commented on Jul 27, 2025 • 0 new comments

• BUG: Raise ValueError on integer indexers containing NA; skip test for unsupported EAs(#56727)

  #61465 commented on Jul 26, 2025 • 0 new comments

• DOC: mention .attrs are preserved in Parquet IO for pyarrow engine

  #61912 commented on Jul 23, 2025 • 0 new comments

• BUG: Fixed issue where rolling.kurt() calculations would be effected by values outside of scope

  #61481 commented on Jul 26, 2025 • 0 new comments

• Implemented NumbaExecutionEngine

  #61487 commented on Jul 24, 2025 • 0 new comments

• ENH: Support Plugin Accessors Via Entry Points

  #61499 commented on Jul 26, 2025 • 0 new comments

• API: Replace na_action parameter in Series/DataFrame/Index.map by the standard skipna

  #61530 commented on Jul 25, 2025 • 0 new comments

• PDEP-18: Nullable Object Dtype

  #61599 commented on Jul 28, 2025 • 0 new comments

• feature #58141: Consistent naming conventions for string dtype aliases

  #61651 commented on Jul 27, 2025 • 0 new comments

• Raise MergeError on mismatched signed/unsigned int merge keys

  #61694 commented on Jul 26, 2025 • 0 new comments

• CI: add PyPI Trusted-Publishing “publish” job to wheels workflow (#61669)

  #61718 commented on Jul 29, 2025 • 0 new comments

• adding pandas.api.typing.aliases and docs

  #61735 commented on Jul 24, 2025 • 0 new comments

• BUG FIX: None of the included dtypes present in df will raise ValueError with clear error message.

  #61871 commented on Jul 26, 2025 • 0 new comments

• TST: Adding tests for validating DataFrame.__setitem__ and .loc behavior

  #61822 commented on Jul 29, 2025 • 0 new comments

• Copy-on-Write (PDEP-7) follow-up overview issue

  #48998 commented on Jul 22, 2025 • 0 new comments

• BUG: Type error supplying SQLAlchemy NVARCHAR length in to_sql()

  #61660 commented on Jul 23, 2025 • 0 new comments

• Output formatting: the repr of the Categorical categories (quoted or unquoted strings?)

  #61890 commented on Jul 23, 2025 • 0 new comments

• BUG: isna() does not catch np.NaN when datatype is Float64

  #60106 commented on Jul 23, 2025 • 0 new comments

• BUG: Pandas Series with Xarray slow print time.

  #61809 commented on Jul 23, 2025 • 0 new comments

• BUG: tz_localize(None) with Arrow timestamp

  #61780 commented on Jul 24, 2025 • 0 new comments

• ENH: Include line number and number of fields when read_csv() callable raises ParserWarning

  #61838 commented on Jul 24, 2025 • 0 new comments

• DOC/ERR: better error message on unsuccessful datetime parsing

  #10720 commented on Jul 24, 2025 • 0 new comments

• BUG: Decimal and float-to-int conversion issues with pyarrow ≥18.0.0 in parquet and Arrow dtype tests

  #61464 commented on Jul 24, 2025 • 0 new comments

• BUG: CustomBusinessDay not respecting calendar

  #60647 commented on Jul 24, 2025 • 0 new comments

• BUG: should constructing Index from a Series make a copy?

  #42934 commented on Jul 24, 2025 • 0 new comments

• ENH: Add Polars engine to read_csv

  #61813 commented on Jul 24, 2025 • 0 new comments

• DOC: use shared_docs for isna/notna & isnull/notnull

  #17096 commented on Jul 25, 2025 • 0 new comments

• DOC: SQL-style join conditions

  #57722 commented on Jul 25, 2025 • 0 new comments

• ENH: Images embedded in cells. The DISPIMG function of WPS

  #61888 commented on Jul 25, 2025 • 0 new comments

• DOC: min_itemsize for HDFStore append for encoded strings

  #14601 commented on Jul 25, 2025 • 0 new comments

• BUG: Python 3.14 may not increment refcount

  #61368 commented on Jul 25, 2025 • 0 new comments

• DOC: add button to edit on GitHub

  #39859 commented on Jul 26, 2025 • 0 new comments

• DOC: Simplify pandas theme footer

  #51536 commented on Jul 26, 2025 • 0 new comments

• String dtype: backwards compatibility of selecting "object" vs "str" columns in `select_dtypes`

  #61916 commented on Jul 26, 2025 • 0 new comments

• BUG: `IntervalIndex.unique()` only contains the first interval if all interval borders are negative

  #61917 commented on Jul 26, 2025 • 0 new comments

• BUG: Series.str.isdigit with pyarrow dtype doesn't honor unicode superscripts

  #61466 commented on Jul 26, 2025 • 0 new comments

• DOC: section on caveats of storing lists inside DataFrame/Series

  #17027 commented on Jul 26, 2025 • 0 new comments

• BUG: `series.reindex(mi)` behaves different for series with Index and MultiIndex

  #60923 commented on Jul 26, 2025 • 0 new comments

• ENH: adding .unique() to DF (or return_inverse for duplicated)

  #21357 commented on Jul 27, 2025 • 0 new comments

• DOC: floating point precision on writing/reading to csv

  #13159 commented on Jul 27, 2025 • 0 new comments

• method `df.merge` is resetting the index

  #51796 commented on Jul 28, 2025 • 0 new comments

• BUG: union of MultiIndex throws exception for datetime and pd.Timestamp with identical values

  #61807 commented on Jul 28, 2025 • 0 new comments

• BUG: assert_frame_equal(check_dtype=False) fails when comparing two DFs containing pd.NA that only differ in dtype (object vs Int32)

  #61473 commented on Jul 28, 2025 • 0 new comments

• RLS: 3.0

  #57064 commented on Jul 28, 2025 • 0 new comments

• BUG: Column of dtype Categorical in DataFrame encounters error when taking a row that includes nan in the column

  #58954 commented on Jul 28, 2025 • 0 new comments