14 Pull requests merged by 10 people

• TST: nan->NA in non-construction tests

  #62021 merged Aug 4, 2025

• EHN: return early when the result is None

  #62032 merged Aug 4, 2025

• Bump pypa/cibuildwheel from 3.1.1 to 3.1.3

  #62039 merged Aug 4, 2025

• TST: Speed up hypothesis and slow tests

  #62028 merged Aug 3, 2025

• BUG: Change default of observed in Series.groupby

  #62025 merged Aug 2, 2025

• BUG: Avoid copying categorical codes if copy=False

  #62000 merged Aug 1, 2025

• DOC: Improve documentation for DataFrame.__setitem__ and .loc assignment from Series

  #61804 merged Aug 1, 2025

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

  #61970 merged Jul 30, 2025

• TST: Raise on pytest.PytestWarning

  #61996 merged Jul 30, 2025

• BUG/DEPR: logical operation with bool and string

  #61995 merged Jul 29, 2025

• 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

22 Pull requests opened by 17 people

• 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: Fix ExtensionArray binary op protocol

  #61990 opened Jul 29, 2025

• DOC: documenting pandas.MultIndex.argsort

  #62005 opened Jul 30, 2025

• DOC: Standardize noncompliant docstrings in pandas/io/html.py (flake8-docstrings) #61944

  #62007 opened Jul 31, 2025

• BUG FIX: pandas.arrays.IntervalArray.overlaps() incorrectly documents that it accepts IntervalArray.

  #62009 opened Jul 31, 2025

• BUG: Fix assert_series_equal for categoricals with nulls and check_category_order=False (#62008)

  #62011 opened Jul 31, 2025

• Fix cbusday calendar Typecheck v2

  #62014 opened Jul 31, 2025

• DOC: Add SSLCertVerificationError warning message for documentation b…

  #62015 opened Jul 31, 2025

• DOC: Add example for multi-column joins using `merge`

  #62016 opened Aug 1, 2025

• BUG: Fix assert_series_equal with check_category_order=False for categoricals with nulls

  #62017 opened Aug 1, 2025

• REF: make copy keyword in recode_for_categories keyword only

  #62019 opened Aug 1, 2025

• BUG: Fix is_signed_integer_dtype to handle abstract floating types (GH 62018)

  #62020 opened Aug 1, 2025

• continue from #61957 which closed with unmerged commit

  #62023 opened Aug 2, 2025

• BUG: groupby.idxmin/idxmax with all NA values should raise

  #62026 opened Aug 2, 2025

• DOC: fix mask/where docstring alignment note (#61781)

  #62029 opened Aug 2, 2025

• BUG: Catch TypeError in _is_dtype_type when converting abstract numpy types (#62018)

  #62030 opened Aug 3, 2025

• API: timestamp resolution inference: default to microseconds when possible

  #62031 opened Aug 3, 2025

• BUG: raise a proper exception when str.rsplit is passed a regex and clarify the docs

  #62035 opened Aug 3, 2025

• API: improve dtype in df.where with EA other

  #62038 opened Aug 3, 2025

• API: mode.nan_is_na to consistently distinguish NaN-vs-NA

  #62040 opened Aug 4, 2025

• [pre-commit.ci] pre-commit autoupdate

  #62041 opened Aug 4, 2025

16 Issues closed by 7 people

• issubdtype(<categorical>, np.bool_) raises error

  #9581 closed Aug 2, 2025

• API: Expand read_csv dtype for categoricals

  #14503 closed Aug 2, 2025

• Dask shuffle performance help

  #43155 closed Aug 2, 2025

• ENH: to_offset "year"/"quarter"/"month"/"day"/...?

  #34586 closed Aug 2, 2025

• inf comparison doesn't emulate NaN with use_inf_as_null

  #16756 closed Aug 1, 2025

• DOC: Improve documentation for DataFrame.__setitem__ and .loc assignment from Series

  #61662 closed Aug 1, 2025

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

  #61993 closed Jul 31, 2025

• BUG: the behavior of DataFrameGroupBy.apply(..., include_groups=True) breaks post-mortem debugging

  #61627 closed Jul 31, 2025

• BUG: Writing UUIDs fail

  #61602 closed Jul 31, 2025

• DOC:

  #55125 closed Jul 30, 2025

• BUG: Python Package fails to load for some users, but not others.

  #61991 closed Jul 30, 2025

• BUG (string dtype): logical operation with bool and string failing

  #60234 closed Jul 29, 2025

• 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

12 Issues opened by 10 people

• BUG: rank with object dtype and small values

  #62036 opened Aug 3, 2025

• BUG: Wrong inferred type in case of a mixture of boolean, float and integers

  #62033 opened Aug 3, 2025

• BUG: NaN vs NA in mixed reduction

  #62024 opened Aug 2, 2025

• DEPR: convert_dtypes keywords

  #62022 opened Aug 2, 2025

• BUG: pd.api.types.is_signed_integer_dtype(np.floating) throws TypeError

  #62018 opened Aug 1, 2025

• BUG: Sql select from database type cast issue

  #62013 opened Jul 31, 2025

• DOC: Series and DataFrame.reindex accepts Timedelta as tolerance, which is not documented

  #62010 opened Jul 31, 2025

• BUG: `assert_series_equal` broken with `check_category_order=False` for arrays with null values

  #62008 opened Jul 31, 2025

• BUG: `IntervalArray.overlaps()` documents that it accepts another `IntervalArray`, but it is not implemented

  #62004 opened Jul 30, 2025

• ENH: error messages for missing performance dependencies should point out the options

  #62001 opened Jul 30, 2025

• DOC: documenting pandas.MultIndex.argsort

  #61998 opened Jul 29, 2025

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

  #61992 opened Jul 29, 2025

85 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.

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

  #61946 commented on Jul 30, 2025 • 10 new comments

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

  #61969 commented on Aug 1, 2025 • 7 new comments

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

  #61941 commented on Jul 29, 2025 • 6 new comments

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

  #61964 commented on Jul 30, 2025 • 5 new comments

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

  #61920 commented on Aug 1, 2025 • 4 new comments

• ENH: usecols takes input order for read_csv implementation review

  #61967 commented on Aug 3, 2025 • 3 new comments

• ENH: Implement PDEP-17

  #61468 commented on Aug 4, 2025 • 2 new comments

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

  #61924 commented on Aug 1, 2025 • 2 new comments

• API: timestamp resolution inference - default to one unit (if possible) instead of being data-dependent?

  #58989 commented on Aug 3, 2025 • 0 new comments

• BUG/API: round-tripping non-nano datetime64s with to_json/read_json

  #55827 commented on Aug 3, 2025 • 0 new comments

• BUG: pd.Timestamp() defaults to [s] resolution instead of [ns]

  #52653 commented on Aug 3, 2025 • 0 new comments

• API: resolution for date_range, to_datetime, timedelta_range, to_timedelta

  #49060 commented on Aug 3, 2025 • 0 new comments

• BUG: Python 3.14 may not increment refcount

  #61368 commented on Aug 3, 2025 • 0 new comments

• ENH: Add a safe Option to hash_pandas_object with Default Value Set to True

  #60428 commented on Aug 3, 2025 • 0 new comments

• ENH: Add a name parameter to value_counts()

  #55121 commented on Aug 3, 2025 • 0 new comments

• BUG: Instantiating pandas._libs.parsers.TextReader segfaults

  #53131 commented on Aug 4, 2025 • 0 new comments

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

  #61962 commented on Jul 29, 2025 • 0 new comments

• BUG: groupby.idxmin/idxmax will all NA values

  #57745 commented on Aug 2, 2025 • 0 new comments

• BUG: ValueError: Buffer dtype mismatch, expected 'intp_t' but got 'long long' on ARMv7 32 bit

  #55305 commented on Aug 2, 2025 • 0 new comments

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

  #61951 commented on Aug 2, 2025 • 0 new comments

• Add axis argument to DataFrame.corr

  #35002 commented on Aug 2, 2025 • 0 new comments

• ENH: .interval accessor

  #16401 commented on Aug 2, 2025 • 0 new comments

• Groupby.mode() - feature request

  #19254 commented on Aug 2, 2025 • 0 new comments

• ENH: Add Support for GroupBy Numeric Operations

  #20060 commented on Aug 2, 2025 • 0 new comments

• ENH: Implementing NEP 18's __array_function__

  #26380 commented on Aug 2, 2025 • 0 new comments

• Idea: Make pd.Index.values not writable

  #33001 commented on Aug 2, 2025 • 0 new comments

• DOC: added button to edit on GitHub

  #61956 commented on Aug 4, 2025 • 0 new comments

• TST: run python-dev CI on 3.14-dev

  #61950 commented on Aug 3, 2025 • 0 new comments

• Updating error message to include more details about dataframe

  #61929 commented on Jul 30, 2025 • 0 new comments

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

  #61925 commented on Aug 3, 2025 • 0 new comments

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

  #61912 commented on Jul 31, 2025 • 0 new comments

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

  #61820 commented on Jul 30, 2025 • 0 new comments

• BUG: fillna with DataFrame input should preserve dtype when possible

  #61742 commented on Jul 31, 2025 • 0 new comments

• API: consistent NaN treatment for pyarrow dtypes

  #61732 commented on Aug 2, 2025 • 0 new comments

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

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

• BUG: Fix GroupBy aggregate coersion of outputs inconsistency for pyarrow dtypes

  #61640 commented on Aug 2, 2025 • 0 new comments

• ENH: Add `force_suffixes` boolean argument to `pd.merge`

  #61498 commented on Aug 2, 2025 • 0 new comments

• Implemented NumbaExecutionEngine

  #61487 commented on Jul 31, 2025 • 0 new comments

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

  #61457 commented on Jul 29, 2025 • 0 new comments

• ENH: support reading directory in read_csv

  #61275 commented on Aug 2, 2025 • 0 new comments

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

  #60772 commented on Jul 30, 2025 • 0 new comments

• BUG: NameError: name 'pa' is not defined despite `pyarrow` is installed

  #60573 commented on Aug 4, 2025 • 0 new comments

• Decrypting file in read_csv

  #44097 commented on Aug 4, 2025 • 0 new comments

• BUG: CustomBusinessDay not respecting calendar

  #60647 commented on Jul 30, 2025 • 0 new comments

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

  #61466 commented on Jul 30, 2025 • 0 new comments

• BUG: resampling with origin='end_day' raises ValueError: Values falls before first bin

  #44957 commented on Jul 30, 2025 • 0 new comments

• BUG: Operations not implemented for non-1D ExtensionArrays

  #61866 commented on Jul 30, 2025 • 0 new comments

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

  #54792 commented on Jul 29, 2025 • 0 new comments

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

  #61940 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

• Thousands separator for to_csv

  #30045 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

• ENH: ExcelWriter append or create mode

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

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

  #61944 commented on Jul 29, 2025 • 0 new comments

• BUG: Boolean Column Indexing Issue in Pandas

  #61980 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

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

  #61955 commented on Jul 29, 2025 • 0 new comments

• BUG: `Index` accepts lists as values

  #61937 commented on Jul 29, 2025 • 0 new comments

• BUG: pandas.Index takes multidimensional array as input

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

• DOC: Enforce Numpy Docstring Validation (Parent Issue)

  #58063 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

• API: Breaking Changes in 3.0 (without deprecations)

  #44823 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

• RLS: 3.0

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

• QST: "Dummy" is rooted in ableist language

  #35724 commented on Aug 2, 2025 • 0 new comments

• ENH: Include df.attrs in to_csv output

  #53577 commented on Aug 2, 2025 • 0 new comments

• ENH: Disallow duplicate column names everywhere by default

  #53217 commented on Aug 2, 2025 • 0 new comments

• ENH: Include `df.attrs` in `to_json` output

  #51012 commented on Aug 2, 2025 • 0 new comments

• BUG: Read hdfs:/// is broken since 2.1.0

  #58078 commented on Aug 1, 2025 • 0 new comments

• 'base' argument when resampling has no effect

  #22855 commented on Aug 1, 2025 • 0 new comments

• ENH: convert masked arrays for Series

  #20427 commented on Aug 1, 2025 • 0 new comments

• Read_csv leaks memory when used in multiple threads

  #19941 commented on Aug 1, 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 Aug 1, 2025 • 0 new comments

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

  #61939 commented on Aug 1, 2025 • 0 new comments

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

  #61975 commented on Jul 31, 2025 • 0 new comments

• BUG: read_sql no longer works simply with SqlAlchemy selectables and a quick fix

  #35484 commented on Jul 31, 2025 • 0 new comments

• BUG: Merge fails on pyarrow datetime columns

  #61926 commented on Jul 31, 2025 • 0 new comments

• DOC: warn about apply with raw=True, if function returns Optional[int]

  #61632 commented on Jul 31, 2025 • 0 new comments

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

  #61943 commented on Jul 30, 2025 • 0 new comments

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

  #61973 commented on Jul 30, 2025 • 0 new comments

• DOC: add button to edit on GitHub

  #39859 commented on Jul 30, 2025 • 0 new comments

• DOC: Enhance '10 minute to pandas' by providing video walkthrough to help auditory learners and improve accessibility.

  #59359 commented on Jul 30, 2025 • 0 new comments

• ENH: error message context.

  #61834 commented on Jul 30, 2025 • 0 new comments

• FEEDBACK: PyArrow as a required dependency and PyArrow backed strings

  #54466 commented on Jul 30, 2025 • 0 new comments

• BUG: Inconsistent .values NA/NaN

  #61856 commented on Jul 30, 2025 • 0 new comments