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BUG: assignment fails with copy_on_write = True

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

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

Status: Open.

#60309 In pandas-dev/pandas;

· kameamea opened on Nov 14, 2024

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

Arrowpyarrow functionalitypyarrow functionality

Bug

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

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

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

Status: Open.

#61466 In pandas-dev/pandas;

· GarrettWu opened on May 20, 2025

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

Bug

CategoricalCategorical Data TypeCategorical Data Type

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

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Open.

#61675 In pandas-dev/pandas;

· tvoipio opened on Jun 18, 2025

String dtype: backwards compatibility of selecting "object" vs "str" columns in <code>select_dtypes</code>

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

Status: Open.

#61916 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 21, 2025

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

Arrowpyarrow functionalitypyarrow functionality

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

Status: Open (in progress).

pandas-dev/pandasnumber 61962

#61962 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 26, 2025

BUG: StringArray __array_ufunc__ validation of result should not require strings

Bug

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

Status: Open.

#40800 In pandas-dev/pandas;

· johnflavin opened on Apr 6, 2021

Backport PR #62217 on branch 2.3.x (BUG: fix memory leak in JSON datetime serialization)

Status: Open (in progress).

pandas-dev/pandasnumber 62253

#62253 In pandas-dev/pandas;

· swt2c opened on Sep 4, 2025

BUG: FutureWarning about 'isin' where it is not used

Bug

expressionspd.eval, querypd.eval, query

WarningsWarnings that appear or should be added to pandasWarnings that appear or should be added to pandas

Status: Open.

#57028 In pandas-dev/pandas;

· workflowsguy opened on Jan 23, 2024

String dtype: keep select_dtypes(include=object) selecting string columns

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

Status: Open (in progress).

pandas-dev/pandasnumber 62323

#62323 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 12, 2025

BUG: Fixed assign failure when with Copy-on-Write

Bug

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

Status: Open (in progress).

pandas-dev/pandasnumber 60941

#60941 In pandas-dev/pandas;

· chilin0525 opened on Feb 16, 2025

BUG: str.fullmatch behavior is not the same for object dtype and string[pyarrow] dtype

Arrowpyarrow functionalitypyarrow functionality

Bug

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

Status: Open.

#61072 In pandas-dev/pandas;

· ptth222 opened on Mar 7, 2025

BUG: fix bug in str.fullmatch for Arrow backend with optional groups

Arrowpyarrow functionalitypyarrow functionality

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

Status: Open (in progress).

pandas-dev/pandasnumber 61073

#61073 In pandas-dev/pandas;

· ptth222 opened on Mar 7, 2025

RLS: 2.3.3

Release

Status: Open.

#62330 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 12, 2025

[backport 2.3.x] CoW: disable chained assignment detection for Python 3.14 (#62324)

Status: Open (in progress).

pandas-dev/pandasnumber 62375

#62375 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 18, 2025