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[backport 2.3.x] BUG: fix fill value for gouped sum in case of unobserved categories for string dtype (empty string instead of 0) (#61909)

Status: Open (in progress).

pandas-dev/pandasnumber 61963

#61963 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 26, 2025

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