20 Pull requests merged by 14 people

• Bug: Save original index and remap after function completes

  #61116 merged Apr 15, 2025

• DOC: Add documentation for groupby.expanding()

  #61274 merged Apr 14, 2025

• DOC: Add documentation for groupby.ewm()

  #61283 merged Apr 14, 2025

• BUG: Fix pyarrow categoricals not working for pivot and multiindex

  #61193 merged Apr 14, 2025

• BUG: OverflowError when fillna on DataFrame with a pd.Timestamp (#61208)

  #61216 merged Apr 14, 2025

• PERF: future_stack=True with non-MulitIndex columns

  #58817 merged Apr 14, 2025

• BUG: Improve ImportError message to suggest importing dependencies directly for full error details

  #61084 merged Apr 14, 2025

• API: Rename arg to func in Series.map

  #61264 merged Apr 14, 2025

• DOC: Updated link for OVH server benchmark visualization

  #61108 merged Apr 13, 2025

• WEB: Removed Coiled as a sponsor, and update past sponsors list

  #61278 merged Apr 13, 2025

• WEB: Add pandas cookbook 3 to home page

  #61279 merged Apr 12, 2025

• Add Pandas Cookbook to Book Recommendations

  #61271 merged Apr 11, 2025

• TYP: Add ignores for numpy 2.2 updates

  #61265 merged Apr 10, 2025

• CI Use released numpy for Windows wheels testing

  #61248 merged Apr 10, 2025

• Changed term non-null to NA

  #61257 merged Apr 10, 2025

• CI: Pin Cython to a specific commit Window PY3.13t builds

  #61261 merged Apr 9, 2025

• BLD: Try installing older Cython for windows free threading build

  #61249 merged Apr 9, 2025

• DOC: Update the last ArcticDB link in ecosystem.md

  #61258 merged Apr 9, 2025

• BUG: Handle overlapping line and scatter on the same plot

  #61244 merged Apr 9, 2025

• ENH: Support Series[bool] as indexer for iloc.__getitem__

  #61162 merged Apr 9, 2025

5 Pull requests opened by 5 people

• Bugfix 61155

  #61263 opened Apr 9, 2025

• [WIP] ENH: support reading directory in read_csv

  #61275 opened Apr 12, 2025

• ENH: Update DataFrame.to_stata to handle pd.NA and None values in strL columns

  #61286 opened Apr 14, 2025

• BUG: Fix #46726; wrong result with varying window size min/max rolling calc.

  #61288 opened Apr 14, 2025

• WEB: Update benchmarks page

  #61289 opened Apr 14, 2025

24 Issues closed by 6 people

• PERF: Surprisingly slow nlargest with duplicates in the index

  #55767 closed Apr 15, 2025

• DOC: Add documentation for groupby.expanding()

  #61254 closed Apr 14, 2025

• DOC: Add documentation for `groupby.ewm()`

  #61268 closed Apr 14, 2025

• BUG: `DataFrame.pivot` fails with `pyarrow` backend if variable is already encoded as `dictionary`

  #53051 closed Apr 14, 2025

• BUG: OverflowError when fillna on DataFrame with a pd.Timestamp

  #61208 closed Apr 14, 2025

• PERF: df.unstack() is 500 times slower since pandas>=2.1

  #58391 closed Apr 14, 2025

• BUG: Dependency check custom error loses information

  #61030 closed Apr 14, 2025

• DOC: to_json for stream object

  #61280 closed Apr 14, 2025

• API: Rename arg to func in Series.map for consistency

  #61260 closed Apr 14, 2025

• BUG: pandas change in style overrides defaults format for other columns

  #61269 closed Apr 13, 2025

• DOC: Conbench PoC benchmark is down

  #60915 closed Apr 13, 2025

• Potential regression induced by PR #57302

  #57620 closed Apr 13, 2025

• BUG: TypeError: Cannot convert numpy.ndarray to numpy.ndarray

  #60184 closed Apr 13, 2025

• BUG: Unexpected behavior change in DataFrame.min(axis=1) with numpy.array elements in pandas 2.2 vs pandas 1.1

  #61270 closed Apr 13, 2025

• WEB: Remove NumFOCUS and Coiled as sponsors

  #61277 closed Apr 13, 2025

• BUG: Inconsistent date resolution

  #61267 closed Apr 13, 2025

• DOC: Specify what "non-null" means in DataFrame.info()

  #60802 closed Apr 10, 2025

• API: creating DataFrame with no columns: object vs string dtype columns?

  #60338 closed Apr 9, 2025

• No Windows free-threaded wheel available in scientific-python-nightly-wheels

  #61242 closed Apr 9, 2025

• BUG: scatter and line matplotlib plots not compatible for sharex=True datetime plots

  #61005 closed Apr 9, 2025

• BUG: `iloc` with `Series` as indexer fails for `__getitem__` but works with `__setitem__`

  #60994 closed Apr 9, 2025

• BUG: AttributeError: 'SparseArray' object has no attribute 'round'

  #61252 closed Apr 8, 2025

• BUG: Selecting the wrong first column

  #61253 closed Apr 8, 2025

• PERF: future_stack is too slow

  #61251 closed Apr 8, 2025

8 Issues opened by 8 people

• BUG: reindex (and atleast several other methods) do not respect fill_value=None

  #61291 opened Apr 15, 2025

• ENH: read_xml() does not allow to specify huge_tree=True for the 'lxml' parser.

  #61290 opened Apr 14, 2025

• ENH: pd.DataFrame.from_dict() should support loading columns of varying lengths

  #61282 opened Apr 14, 2025

• ENH: preview_csv(***.csv) for Fast First-N-Line Preview on Large Plus Size (>100GB)

  #61281 opened Apr 13, 2025

• BUG:FutureWarning for palette parameter without hue in faceted distributions

  #61276 opened Apr 12, 2025

• ENH: Add `tzdata` to the `_hard_dependencies`

  #61273 opened Apr 11, 2025

• BUILD: Error installing pandas 2.2.3 on AIX 7.3 system (error: conflicting types for lockf64, lseek64, ftruncate64..)

  #61272 opened Apr 11, 2025

• ENH: Utility to return "feasible" dtype for `infer_dtype` output.

  #61256 opened Apr 8, 2025

102 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.

• DOC: User Guide Page on user-defined functions

  #61195 commented on Apr 13, 2025 • 10 new comments

• BUG: Handle overlapping line and bar on the same plot

  #61173 commented on Apr 14, 2025 • 7 new comments

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

  #60772 commented on Apr 12, 2025 • 5 new comments

• BUG: Pyarrow timestamp support for map() function

  #61236 commented on Apr 14, 2025 • 5 new comments

• BUG(string dtype): groupby/resampler.min/max returns float on all NA strings

  #60985 commented on Apr 14, 2025 • 3 new comments

• FIX: date comparison fails when series is all pd.NaT values #61188

  #61200 commented on Apr 12, 2025 • 3 new comments

• BUG: Raise error if not busdaycalendar

  #61250 commented on Apr 12, 2025 • 3 new comments

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

  #61226 commented on Apr 14, 2025 • 2 new comments

• String dtype: more informative repr (keeping brief __str__)

  #61148 commented on Apr 12, 2025 • 1 new comment

• BUG: Added deprecation warning to Timestamp constructor

  #61149 commented on Apr 12, 2025 • 1 new comment

• ENH: Add dropna parameter to Series.unique() (fixes #61209)

  #61237 commented on Apr 12, 2025 • 0 new comments

• DEPS: Revert SQLAlchemy minimum version back to 1.4.36

  #60977 commented on Apr 12, 2025 • 0 new comments

• My feature branch to issue #19129 (read_json and orient='table' With Numeric Column)

  #60945 commented on Apr 12, 2025 • 0 new comments

• Bug cov nat

  #60898 commented on Apr 12, 2025 • 0 new comments

• expand on different Getitem uses

  #60806 commented on Apr 12, 2025 • 0 new comments

• Fix issue #47101

  #59766 commented on Apr 12, 2025 • 0 new comments

• TST(string dtype): Resolve xfails in test_from_dummies

  #60694 commented on Apr 12, 2025 • 0 new comments

• Remove editable installs from CI

  #60686 commented on Apr 12, 2025 • 0 new comments

• Relax meson pins in CI and Fix Missed Warnings

  #60681 commented on Apr 12, 2025 • 0 new comments

• Implement String Accumulations with nanoarrow

  #60667 commented on Apr 12, 2025 • 0 new comments

• Update docs for generating unoptimized debug builds

  #60666 commented on Apr 12, 2025 • 0 new comments

• Fix BUG: read_sql tries to convert blob/varbinary to string with pyarrow backend

  #60105 commented on Apr 12, 2025 • 0 new comments

• DEPS: Bump optional dependencies

  #60655 commented on Apr 12, 2025 • 0 new comments

• TST (string dtype): clean-up interpolate tests

  #60653 commented on Apr 12, 2025 • 0 new comments

• CI: add test build with numpy 1.26 (<2)

  #60154 commented on Apr 12, 2025 • 0 new comments

• TST (string dtype): resolve xfails for frame methods

  #60336 commented on Apr 12, 2025 • 0 new comments

• Implement first-class List type

  #60629 commented on Apr 12, 2025 • 0 new comments

• ENH: Allow `s.map(d, na_action='raise')`

  #60482 commented on Apr 12, 2025 • 0 new comments

• BUG: Copy attrs on pd.merge()

  #60357 commented on Apr 12, 2025 • 0 new comments

• TST (string dtype): clean-up assorted xfails

  #60354 commented on Apr 12, 2025 • 0 new comments

• ENH: Add dropna parameter to Series.unique() (fixes #61209)

  #61235 commented on Apr 12, 2025 • 0 new comments

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

  #61234 commented on Apr 13, 2025 • 0 new comments

• BUG: Fix scatter plot colors in groupby context to match line plot behavior (#59846)

  #61233 commented on Apr 13, 2025 • 0 new comments

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

  #61225 commented on Apr 12, 2025 • 0 new comments

• ENH: Create infrastructure for translations

  #61220 commented on Apr 12, 2025 • 0 new comments

• Fix #58421: Index[timestamp[pyarrow]].union with itself return object type

  #61219 commented on Apr 12, 2025 • 0 new comments

• BUG: fix to_json on period

  #61203 commented on Apr 12, 2025 • 0 new comments

• ENH: Reimplement DataFrame.lookup

  #61185 commented on Apr 12, 2025 • 0 new comments

• update offsets.pyx to fix #60647

  #61181 commented on Apr 12, 2025 • 0 new comments

• DataFrame.dtypes.to_json OverflowError: Maximum recursion level reached

  #61171 commented on Apr 12, 2025 • 0 new comments

• Preserve Complex Data Types for to_csv

  #61157 commented on Apr 12, 2025 • 0 new comments

• ENH: Added dict support for `pd.set_option`

  #61151 commented on Apr 12, 2025 • 0 new comments

• BUG: Preserve column names in DataFrame.from_records when nrows=0

  #61143 commented on Apr 12, 2025 • 0 new comments

• BUG: Collision between equivalent frequencies 'QS-…

  #61142 commented on Apr 12, 2025 • 0 new comments

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

  #61138 commented on Apr 12, 2025 • 0 new comments

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

  #61101 commented on Apr 12, 2025 • 0 new comments

• Bug: Fix for overflow at edge cases in `normalize()` by raising exception

  #61083 commented on Apr 12, 2025 • 0 new comments

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

  #61061 commented on Apr 12, 2025 • 0 new comments

• BUG: Fix return type of loc/iloc

  #61054 commented on Apr 13, 2025 • 0 new comments

• perf: improve membership check performance in column filtering

  #61046 commented on Apr 12, 2025 • 0 new comments

• ENH(string dtype): fallback for HDF5 with UTF-8 surrogates

  #60993 commented on Apr 14, 2025 • 0 new comments

• ENH: add basic DataFrame.from_arrow class method for importing through Arrow PyCapsule interface

  #59696 commented on Apr 12, 2025 • 0 new comments

• API / COW: ensure every new Series/DataFrame also has new (shallow copy) index

  #53699 commented on Apr 12, 2025 • 0 new comments

• PDEP-11: Change default of dropna to False

  #53094 commented on Apr 12, 2025 • 0 new comments

• BLD: Split out tests into pandas_tests package

  #53007 commented on Apr 12, 2025 • 0 new comments

• Render PDEPs using myst-parser and the sphinx doc theme

  #51467 commented on Apr 12, 2025 • 0 new comments

• PDEP-8: Inplace methods in pandas

  #51466 commented on Apr 12, 2025 • 0 new comments

• [READY] perf improvements for strftime

  #51298 commented on Apr 12, 2025 • 0 new comments

• Improve the apply/map APIs

  #61128 commented on Apr 15, 2025 • 0 new comments

• BUG: Timedelta created by to_timedelta does not add correctly to datetime in Pandas 2

  #53643 commented on Apr 15, 2025 • 0 new comments

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

  #55231 commented on Apr 14, 2025 • 0 new comments

• BUG: `read_html` does not properly structure some html table elements (possible `rowspan` or `colspan` issues)

  #58461 commented on Apr 14, 2025 • 0 new comments

• BUG: Empty list passed to `Series` returns `object` dtype, but via `DataFrame` returns `float64`

  #56679 commented on Apr 13, 2025 • 0 new comments

• ENH: adding a filter (and bold) to header when writing to excel

  #61194 commented on Apr 13, 2025 • 0 new comments

• weighted mean

  #10030 commented on Apr 11, 2025 • 0 new comments

• BUG: setting item to iterable with .at fails when column doesn't exist or has wrong dtype

  #61223 commented on Apr 10, 2025 • 0 new comments

• ENH: Enable nsmallest/nlargest on object dtype

  #61166 commented on Apr 10, 2025 • 0 new comments

• ENH: Functionality to aid with Database Imports

  #61247 commented on Apr 9, 2025 • 0 new comments

• QST: Should the absence of tzdata package affect the performance in any way ?

  #61218 commented on Apr 9, 2025 • 0 new comments

• BUG: Unknown slicing behavior for Multiindexing when passing through str for int

  #60104 commented on Apr 9, 2025 • 0 new comments

• BUG: allow complex type in convert_dtypes

  #60129 commented on Apr 9, 2025 • 0 new comments

• BUG: Boolean selection edge case.

  #61191 commented on Apr 8, 2025 • 0 new comments

• BUG: date comparison fails when series is all pd.NaT values

  #61188 commented on Apr 8, 2025 • 0 new comments

• ENH: Consistent NA handling in `unique()`, and `nunique()`

  #61209 commented on Apr 8, 2025 • 0 new comments

• BUG: remove_unused_levels does not keep index levels order

  #61245 commented on Apr 8, 2025 • 0 new comments

• ENH: The method of obtaining a certain cell or slice of the dataframe is confusing and unclear

  #61232 commented on Apr 8, 2025 • 0 new comments

• BUG: melt no longer supports id_vars and value_vars collapsing levels accross MultiIndex

  #57663 commented on Apr 8, 2025 • 0 new comments

• BUG: groupby.agg with UDF changing pyarrow dtypes

  #59601 commented on Apr 12, 2025 • 0 new comments

• Use bitmask for MaskedArray mask

  #59410 commented on Apr 12, 2025 • 0 new comments

• BUG: `groupby` then `resample` on column gives incorrect results if the index is out of order

  #59408 commented on Apr 12, 2025 • 0 new comments

• TST: Added script to enforce usage of match argument for tm.assert_produces_warning

  #59173 commented on Apr 12, 2025 • 0 new comments

• PDEP-16: Consistent missing value handling

  #58988 commented on Apr 12, 2025 • 0 new comments

• API/CoW: take view of underlying Block values for shallow (deep=False) copies

  #58966 commented on Apr 12, 2025 • 0 new comments

• WEB: Refine PDEP presentation

  #58791 commented on Apr 12, 2025 • 0 new comments

• PDEP-15: Reject PDEP-10

  #58623 commented on Apr 12, 2025 • 0 new comments

• BUG: Assignment of pyarrow arrays yield unexpected dtypes

  #58601 commented on Apr 12, 2025 • 0 new comments

• Allow StringArray[python] to be backed by numpy StringDType in numpy 2.0

  #58578 commented on Apr 12, 2025 • 0 new comments

• PDEP-13: The pandas Logical Type System

  #58455 commented on Apr 12, 2025 • 0 new comments

• BUG: identity checking NA in map incorrect

  #58392 commented on Apr 12, 2025 • 0 new comments

• Add `strict_na` keyword to the assert_.._equal methods for object dtype to help with deprecation

  #58072 commented on Apr 12, 2025 • 0 new comments

• DEPR: resample with PeriodIndex

  #58021 commented on Apr 12, 2025 • 0 new comments

• Remove versioneer / setuptools

  #57941 commented on Apr 12, 2025 • 0 new comments

• DEP: Deprecate CoW and no_silent_downcasting options

  #57872 commented on Apr 12, 2025 • 0 new comments

• Fix stubname equal suffix in wide to long function

  #57868 commented on Apr 12, 2025 • 0 new comments

• PERF: improve StringArray.isna

  #57733 commented on Apr 12, 2025 • 0 new comments

• BUG: groupby.agg should always agg

  #57706 commented on Apr 12, 2025 • 0 new comments

• PERF: Improve merge performance

  #57559 commented on Apr 12, 2025 • 0 new comments

• Remove dtype inference on object dtype indexes for bool

  #57492 commented on Apr 12, 2025 • 0 new comments

• ENH: Implement categorical accessor for arrow arrays

  #56670 commented on Apr 12, 2025 • 0 new comments

• DEPR: object inference in to_stata

  #56536 commented on Apr 12, 2025 • 0 new comments

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

  #55502 commented on Apr 12, 2025 • 0 new comments

• ExtensionArray.Round method and tests

  #54582 commented on Apr 12, 2025 • 0 new comments