23 Pull requests merged by 12 people

• [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

• WEB: Remove Roadmap points pending a PDEP section from Roadmap

  #61892 merged Jul 22, 2025

• DOC: update release process maintainer guide

  #61810 merged Jul 22, 2025

• PDEP-8: Inplace methods in pandas

  #51466 merged Jul 22, 2025

• BUG: fix fill value for gouped sum in case of unobserved categories for string dtype (empty string instead of 0)

  #61909 merged Jul 22, 2025

• Update v3.0.0.rst to use Month XX, 2025 instead of 2024

  #61919 merged Jul 22, 2025

• DOC: Clarify to_numeric behavior for numeric dtypes

  #61904 merged Jul 21, 2025

• DEPR: maybe_infer_ndim

  #61901 merged Jul 21, 2025

• CI: properly enable the string dtype also for custom CI builds

  #61913 merged Jul 21, 2025

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

  #61907 merged Jul 21, 2025

19 Pull requests opened by 13 people

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

  #61920 opened Jul 22, 2025

• 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

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

  #61960 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

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

  #61972 opened Jul 27, 2025

• ENH: Include line number and number of fields when read_csv() callable with `engine="python"` raises ParserWarning

  #61974 opened Jul 27, 2025

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

  #61977 opened Jul 27, 2025

23 Issues closed by 9 people

• 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

• Roadmap page has numbered-only list when should be a mix of numbered and unnumbered

  #60913 closed Jul 22, 2025

• DEPR: ExtensionOpsMixin in favor of OpsMixin

  #37080 closed Jul 22, 2025

• BUG:float_precision type hints differ in release version from github and docs pandas==2.3.1

  #61873 closed Jul 22, 2025

• API/DEPR: Deprecate inplace parameter

  #16529 closed Jul 22, 2025

• QST: Global future flag

  #61918 closed Jul 21, 2025

• DOC: Clarify to_numeric behavior for numeric dtypes

  #61903 closed Jul 21, 2025

• ENH: Make attributes saved by default

  #61906 closed Jul 21, 2025

21 Issues opened by 17 people

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

  #61976 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

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

  #61917 opened Jul 21, 2025

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

  #61916 opened Jul 21, 2025

• BUG: Convertors not running when reading a dataframe from excel using calamine engine

  #61914 opened Jul 20, 2025

75 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 • 12 new comments

• ENH: Implement PDEP-17

  #61468 commented on Jul 27, 2025 • 6 new comments

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

  #61820 commented on Jul 23, 2025 • 6 new comments

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

  #61879 commented on Jul 26, 2025 • 3 new comments

• POC: consistent NaN treatment for pyarrow dtypes

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

• ENH: speed up wide DataFrame.line plots by using a single LineCollection

  #61764 commented on Jul 22, 2025 • 2 new comments

• Doc simplify footer

  #61859 commented on Jul 22, 2025 • 1 new comment

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

  #61912 commented on Jul 23, 2025 • 1 new comment

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

  #55502 commented on Jul 22, 2025 • 0 new comments

• RLS: 3.0

  #57064 commented on Jul 27, 2025 • 0 new comments

• BUG: groupby.agg with UDF changing pyarrow dtypes

  #59601 commented on Jul 24, 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

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

  #61622 commented on Jul 27, 2025 • 0 new comments

• ENH: support reading directory in read_csv

  #61275 commented on Jul 22, 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

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

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

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

  #61636 commented on Jul 24, 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

• 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

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

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

• BUG: fix: `list` as index item does not raise

  #61674 commented on Jul 24, 2025 • 0 new comments

• ENH #61033: Add coalesce_keys option to DataFrame.join for preserving join keys

  #61678 commented on Jul 26, 2025 • 0 new comments

• BUG: Fix lost precision with common type of uint64/int64

  #61679 commented on Jul 21, 2025 • 0 new comments

• Raise MergeError on mismatched signed/unsigned int merge keys

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

• WEB: add note to PDEP-10 about delayed timeline for requiring pyarrow

  #61706 commented on Jul 22, 2025 • 0 new comments

• POC: PDEP16 default to masked nullable dtypes

  #61716 commented on Jul 22, 2025 • 0 new comments

• adding pandas.api.typing.aliases and docs

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

• BUG: Fix assert_frame_equal with check_dtype=False for pd.NA dtype differences (GH#61473)

  #61748 commented on Jul 22, 2025 • 0 new comments

• Improve MultiIndex label rename checks

  #61769 commented on Jul 22, 2025 • 0 new comments

• BUG: DataFrame.aggregate to preserve extension dtypes with callable functions

  #61816 commented on Jul 22, 2025 • 0 new comments

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

  #61822 commented on Jul 22, 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

• DEPR: PeriodDtype.freq

  #61897 commented on Jul 21, 2025 • 0 new comments

• BUG: Raise ParserWarning when on_bad_lines is callable and index_col is set (GH#61882)

  #61902 commented on Jul 22, 2025 • 0 new comments

• BUG: .describe() doesn't work for EAs #61707

  #61910 commented on Jul 22, 2025 • 0 new comments

• BUG: Pandas Series with Xarray slow print time.

  #61809 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

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

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

• RLS: 2.3.1

  #61590 commented on Jul 23, 2025 • 0 new comments

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

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

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

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

• BUG: replace value failed

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

• PERF: parallelize libjoin calls

  #51364 commented on Jul 22, 2025 • 0 new comments

• ENH: New method "ends" as a combination of “head” and "tail"

  #61860 commented on Jul 22, 2025 • 0 new comments

• ENH: Use a neutral format to have lossless interface with scipp, Astropy, Xarray

  #58217 commented on Jul 21, 2025 • 0 new comments

• BUG: DataFrame.join(other) raises InvalidIndexError if column index is CategoricalIndex

  #61675 commented on Jul 21, 2025 • 0 new comments

• BUG: Implicit conversion to float64 with isin()

  #61676 commented on Jul 21, 2025 • 0 new comments

• BUG: Merge duplicates and validation failure when columns have type int64 and uint64

  #61688 commented on Jul 21, 2025 • 0 new comments

• ENH: parallelize DataFrame.corr

  #40956 commented on Jul 21, 2025 • 0 new comments

• DEPR: List of deprecations to be removed in 4.0

  #56596 commented on Jul 21, 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 21, 2025 • 0 new comments

• TRACKER: new default String dtype (pyarrow-backed, numpy NaN semantics)

  #54792 commented on Jul 21, 2025 • 0 new comments

• `suffix` parameter in `Series.shift` not used in the implementation

  #54806 commented on Jul 21, 2025 • 0 new comments

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

  #13159 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

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

  #17027 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: Simplify pandas theme footer

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

• DOC: add button to edit on GitHub

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

• BUG: Python 3.14 may not increment refcount

  #61368 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

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

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

• DOC: SQL-style join conditions

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

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

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

• ENH: Add Polars engine to read_csv

  #61813 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

• BUG: CustomBusinessDay not respecting calendar

  #60647 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

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

  #10720 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

• BUG: tz_localize(None) with Arrow timestamp

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