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Potential regression induced by "Refactored pandas_timedelta_to_timedeltastruct"

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

PerformanceMemory or execution speed performanceMemory or execution speed performance

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#57951 In pandas-dev/pandas;

· DeaMariaLeon opened on Mar 21, 2024

BUG / API: setitem on pandas object fails if underlying numpy array is read-only

API Design

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Status: Open.

#62144 In pandas-dev/pandas;

· jorisvandenbossche opened on Aug 19, 2025

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

API Design

Arrowpyarrow functionalitypyarrow functionality

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#54792 In pandas-dev/pandas;

· jorisvandenbossche opened on Aug 28, 2023

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

Copy / view semantics

Master TrackerHigh level tracker for similar issuesHigh level tracker for similar issues

Status: Open.

#48998 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 7, 2022

BUG: Behavior change in pandas 3.x with Series.resample and closed="right", how="right"

Bug

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Resampleresample methodresample method

Status: Open.

#62200 In pandas-dev/pandas;

· TomAugspurger opened on Aug 26, 2025

PDEP-8 inplace keyword deprecation - implementation tracker issue

inplaceRelating to inplace parameter or equivalentRelating to inplace parameter or equivalent

Master TrackerHigh level tracker for similar issuesHigh level tracker for similar issues

Status: Open.

#63207 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 26, 2025

DEP: Drop NumPy 1.26 support

DependenciesRequired and optional dependenciesRequired and optional dependencies

Status: Open.

#63403 In pandas-dev/pandas;

· rhshadrach opened on Dec 17, 2025

BUG: for ordered categorical data implements correct computation of kendall/spearman correlations

Bug

CategoricalCategorical Data TypeCategorical Data Type

cov/corr

Status: Open (in progress).

pandas-dev/pandasnumber 62880

#62880 In pandas-dev/pandas;

· pandeconscious opened on Oct 27, 2025

API: implement Period(|Dtype|Array|Index).unit, remove ._freqstr

PeriodPeriod data typePeriod data type

Status: Open (in progress).

pandas-dev/pandasnumber 64155

#64155 In pandas-dev/pandas;

· jbrockmendel opened on Feb 15, 2026

BUG: Index accepts lists as values

Bug

ConstructorsSeries/DataFrame/Index/pd.array ConstructorsSeries/DataFrame/Index/pd.array Constructors

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Status: Open.

#61937 In pandas-dev/pandas;

· Dr-Irv opened on Jul 24, 2025

ENH: add sort() method to StringArray and ArrowStringArray

Enhancement

ExtensionArrayExtending pandas with custom dtypes or arrays.Extending pandas with custom dtypes or arrays.

Sortinge.g. sort_index, sort_valuese.g. sort_index, sort_values

Status: Open (in progress).

pandas-dev/pandasnumber 65052

#65052 In pandas-dev/pandas;

· ssam18 opened on Apr 3, 2026

BUG: pandas.DataFrame.max fails on datetime64[ns, ...] columns with different time zones and NaT in the data

Bug

DatetimeDatetime data dtypeDatetime data dtype

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#65500 In pandas-dev/pandas;

· kiss-oliver opened on May 7, 2026

DOC: fix factual errors in development/internals.rst

Docs

Status: Open (in progress).

pandas-dev/pandasnumber 65513

#65513 In pandas-dev/pandas;

· jbrockmendel opened on May 8, 2026

BUG: bdate_range(end, periods, freq=nB) anchors stride at buffer start

Bug

Status: Draft (not ready).

pandas-dev/pandasnumber 65604

#65604 In pandas-dev/pandas;

· jbrockmendel opened on May 11, 2026

BUG: to_datetime origin path silently ignored errors='coerce' (GH-63419)

Status: Open (in progress).

pandas-dev/pandasnumber 65529

#65529 In pandas-dev/pandas;

· jbrockmendel opened on May 8, 2026

CI: Run zizmorcore/zizmor-action for security issues

CIContinuous IntegrationContinuous Integration

Status: Open (in progress).

pandas-dev/pandasnumber 65660

#65660 In pandas-dev/pandas;

· mroeschke opened on May 16, 2026

DEPR: deprecate inplace keyword in the DataFrame.drop() method

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

inplaceRelating to inplace parameter or equivalentRelating to inplace parameter or equivalent

Status: Open (in progress).

pandas-dev/pandasnumber 65683

#65683 In pandas-dev/pandas;

· tamhahn opened on May 19, 2026

REGR (main): MultiIndex.equals now takes into account bitwidth of the codes

Bug

Status: Open.

#65700 In pandas-dev/pandas;

· jorisvandenbossche opened on May 21, 2026

BUG: Fix MultiIndex.equals regression regarding code bit-width (#65700)

Status: Open (in progress).

pandas-dev/pandasnumber 65701

#65701 In pandas-dev/pandas;

· anzinmhd opened on May 21, 2026