20 Pull requests merged by 17 people

• Backport PR #61399: BUG: round on object columns no longer raises a TypeError

  #61472 merged May 21, 2025

• DOC: Expand on different Getitem uses

  #60806 merged May 21, 2025

• BUG: round on object columns no longer raises a TypeError

  #61399 merged May 21, 2025

• fix(doc): #61432 typing

  #61455 merged May 20, 2025

• BUG: Fix #57608: queries on categorical string columns in HDFStore.select() return unexpected results.

  #61225 merged May 20, 2025

• CLN: Expose arguments in DataFrame.query

  #61413 merged May 20, 2025

• DOC: fix two mistakes in missing_data.rst

  #61461 merged May 19, 2025

• PERF: Restore old performances with .isin() on columns typed as np.ui…

  #61320 merged May 19, 2025

• TYP: Update typing for 3.10

  #61453 merged May 19, 2025

• DOC: change pandas.DataFrame.unstack's fill_value param to scalar

  #61459 merged May 19, 2025

• BUG: Fix DataFrame constructor misclassification of array-like with 'name' attribute (#61443)

  #61451 merged May 19, 2025

• API (string dtype): implement hierarchy (NA > NaN, pyarrow > python) for consistent comparisons between different string dtypes

  #61138 merged May 19, 2025

• DOC: User Guide Page on user-defined functions

  #61195 merged May 18, 2025

• DOC: fix typo in merging.rst

  #61449 merged May 17, 2025

• DOC: Skip parallel_coordinaes, andrews_curves doctests

  #61448 merged May 16, 2025

• CI: clean up wheel build workarounds now that Cython 3.1.0 is out

  #61446 merged May 16, 2025

• BLD: Try using shared memory utilities in Cython to reduce wheel sizes

  #61384 merged May 16, 2025

• CI: Upgrade to ubuntu-24.04, install Python free threading from conda-forge

  #61410 merged May 15, 2025

• BUG: Impossible creation of array with dtype=string

  #61263 merged May 15, 2025

• ENH: Implement pandas.read_iceberg

  #61383 merged May 14, 2025

9 Pull requests opened by 8 people

• BUG: Fix Dataframe handling of scalar Timestamp #61444

  #61450 opened May 17, 2025

• BUG: Raise TypeError when joining with non-DataFrame using 'on=' (GH#61434)

  #61454 opened May 18, 2025

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

  #61457 opened May 19, 2025

• Wheels for win_arm64

  #61463 opened May 19, 2025

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

  #61465 opened May 20, 2025

• ENH: Support third-party execution engines in Series.map

  #61467 opened May 20, 2025

• ENH: Implement PDEP-17

  #61468 opened May 20, 2025

• DOC: Restructure and expand UDF page

  #61470 opened May 21, 2025

• Improve lookup documentation

  #61471 opened May 21, 2025

15 Issues closed by 4 people

• BUG: timeseries plot x-axis starts way off when one column is all NaNs

  #36252 closed May 21, 2025

• BUG: round on object columns no longer raises a TypeError

  #61206 closed May 21, 2025

• DOC: Series.name is just Hashable, but many column arguments require str

  #61432 closed May 20, 2025

• BUG: queries on categorical string columns in HDFStore.select() return unexpected results

  #57608 closed May 20, 2025

• ENH: Explicitly opt out of pytz support

  #60025 closed May 20, 2025

• DOC/ENH: Add full list of argument for DataFrame.query

  #61405 closed May 20, 2025

• PERF: Slowdowns with .isin() on columns typed as np.uint64

  #60098 closed May 19, 2025

• DOC: DataFrame.unstack should accept fill_value with more types than just int/str/dict

  #61445 closed May 19, 2025

• BUG: `DataFrame` constructor not compatible with array-like classes that have a `'name'` attribute

  #61443 closed May 19, 2025

• API (string dtype): comparisons between different string classes

  #60639 closed May 19, 2025

• DOC: Write user guide page on apply/map/transform methods

  #61126 closed May 18, 2025

• BUG: Compiler Flag Drift May Affect Pandas ABI Stability via Memory Assumptions

  #61452 closed May 18, 2025

• BUG: DataFrame column assignment with pd.Timestamp leads to unexpected dtype and incorrect JSON output

  #61444 closed May 17, 2025

• BUG: read_csv silently ignores out of bounds errors when parsing date columns

  #61447 closed May 17, 2025

• BUG: Impossible creation of array with dtype=string

  #61155 closed May 15, 2025

8 Issues opened by 8 people

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

  #61473 opened May 21, 2025

• BUG: pandas.pivot_table margins, dropna and observed parameters not producing expected result

  #61469 opened May 21, 2025

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

  #61466 opened May 20, 2025

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

  #61464 opened May 19, 2025

• BUILD: Provide wheel for Windows ARM64

  #61462 opened May 19, 2025

• PERF: Slow Windows / Ubuntu Unit Tests during Status Checks

  #61460 opened May 19, 2025

• Use BaseExecutionEngine for Python and Numba engines

  #61458 opened May 19, 2025

• PERF: Setting an item of incompatible dtype

  #61456 opened May 19, 2025

41 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: Implement translations infrastructure

  #61380 commented on May 21, 2025 • 41 new comments

• ENH: Implemented MultiIndex.searchsorted method ( GH14833)

  #61435 commented on May 21, 2025 • 8 new comments

• Bug cov nat

  #60898 commented on May 21, 2025 • 4 new comments

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

  #60772 commented on May 20, 2025 • 3 new comments

• BUG: Raise MergeError when suffixes result in duplicate column names …

  #61422 commented on May 19, 2025 • 2 new comments

• TST: Testing for mixed int/str Index

  #61349 commented on May 21, 2025 • 1 new comment

• Fix #61072: inconsistent fullmatch results with regex alternation

  #61343 commented on May 20, 2025 • 1 new comment

• ENH: Reimplement DataFrame.lookup

  #61185 commented on May 21, 2025 • 1 new comment

• BUG: Duplicate columns allowed on `merge` if originating from separate dataframes

  #61402 commented on May 15, 2025 • 0 new comments

• BUG: Series.combine_first loss of precision

  #60128 commented on May 21, 2025 • 0 new comments

• ENH: Support for Python 3.13.2 free-threading version

  #60972 commented on May 21, 2025 • 0 new comments

• WEB: Refine PDEP presentation

  #58791 commented on May 21, 2025 • 0 new comments

• DEPS: Revert SQLAlchemy minimum version back to 1.4.36

  #60977 commented on May 19, 2025 • 0 new comments

• ENH, DOC: Add JupyterLite-powered interactive examples for the `pandas` documentation

  #61061 commented on May 18, 2025 • 0 new comments

• BUG: Passing original properties of `DataFrame` and `Series` subclasses to their constructors

  #61101 commented on May 17, 2025 • 0 new comments

• BUG: fix to_json on period

  #61203 commented on May 15, 2025 • 0 new comments

• BUG: Fix #61221: Exception with unstack(sort=False) and NA in index.

  #61226 commented on May 16, 2025 • 0 new comments

• BUG: Fix DatetimeIndex timezone preservation when joining indexes with same timezone but different units

  #61234 commented on May 20, 2025 • 0 new comments

• [WIP] ENH: support reading directory in read_csv

  #61275 commented on May 20, 2025 • 0 new comments

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

  #61381 commented on May 18, 2025 • 0 new comments

• Fix #60766:.map,.apply would convert element type for extension array

  #61396 commented on May 19, 2025 • 0 new comments

• Updating value of a single row of a column using loc or at fails

  #22040 commented on May 16, 2025 • 0 new comments

• BUG: Confusing Behavior When Assigning DataFrame Columns Using `omegaconf.ListConfig`

  #61439 commented on May 17, 2025 • 0 new comments

• BUG: df.rolling.{std, skew, kurt} gives unexpected value

  #61416 commented on May 17, 2025 • 0 new comments

• RLS: 2.3

  #59664 commented on May 17, 2025 • 0 new comments

• ENH: Export (a subset of?) pandas._typing for type checking

  #55231 commented on May 18, 2025 • 0 new comments

• BUG/FEATURE REQUEST: DataFrame.to_sql() tries to create table when it exists

  #61418 commented on May 18, 2025 • 0 new comments

• ENH: Enable nsmallest/nlargest on object dtype

  #61166 commented on May 18, 2025 • 0 new comments

• BUG: Some `ExtensionArray`s can return 0-d Elements

  #61433 commented on May 18, 2025 • 0 new comments

• BUG: Joining Pandas with Polars dataframe produces fuzzy errormessage

  #61434 commented on May 18, 2025 • 0 new comments

• BUG: to_csv() quotechar/escapechar behavior differs from csv module

  #61407 commented on May 19, 2025 • 0 new comments

• BUG: inserting list of strings into Series auto-infers them as datetimes with mixed formats

  #61353 commented on May 20, 2025 • 0 new comments

• ENH: The prompt message in the error does not bring any valid bug prompts

  #61417 commented on May 20, 2025 • 0 new comments

• ENH: access sliced dataframe from rolling.cov

  #61401 commented on May 20, 2025 • 0 new comments

• BUG: engine calamine lost 0 when read_excel from vlookup cell

  #61186 commented on May 20, 2025 • 0 new comments

• BUG: CustomBusinessDay not respecting calendar

  #60647 commented on May 20, 2025 • 0 new comments

• BUG: documented usage of of `str.split(...).str.get` fails on dtype `large_string[pyarrow]`

  #61431 commented on May 20, 2025 • 0 new comments

• TST: Make test_sql.py parallelizable

  #60378 commented on May 20, 2025 • 0 new comments

• BUG: memory leak when slice series var assigning to itself

  #60640 commented on May 21, 2025 • 0 new comments

• ENH: Broaden `dict` to `Mapping` as replace argument

  #61440 commented on May 21, 2025 • 0 new comments

• ENH: re-implement DataFrame.lookup.

  #40140 commented on May 21, 2025 • 0 new comments