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BUG: Using <code>Series.str.fullmatch()</code> and <code>Series.str.match()</code> with a compiled regex fails with arrow strings

Arrowpyarrow functionalitypyarrow functionality

Bug

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

Status: Open.

#61952 In pandas-dev/pandas;

· Dr-Irv opened on Jul 25, 2025

· 

2.3.2

BUG: Implicit upcast to float64 for large series (more than 1000000 rows)

Bug

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

Status: Open.

#61951 In pandas-dev/pandas;

· stertingen opened on Jul 25, 2025

BUG: border attribute used in html.py was deprecated in HTML5

Bug

IO HTMLread_html, to_html, Styler.apply, Styler.applymapread_html, to_html, Styler.apply, Styler.applymap

Status: Open.

#61949 In pandas-dev/pandas;

· JonahDelman opened on Jul 25, 2025

BUG: Fix Series.str.contains with compiled regex on Arrow string dtype (#61942)

Arrowpyarrow functionalitypyarrow functionality

Bug

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

Status: Open (in progress).

pandas-dev/pandasnumber 61946

#61946 In pandas-dev/pandas;

· Aniketsy opened on Jul 25, 2025

· 

2.3.2

BUG: series.groupby(level=0) and series.groupby(pd.Grouper(level=0)) produce different orders

Bug

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

Status: Open.

#61943 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Jul 25, 2025

BUG: Using <code>Series.str.contains()</code> with a compiled regex and arrow strings fails

Arrowpyarrow functionalitypyarrow functionality

Bug

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

Status: Open.

#61942 In pandas-dev/pandas;

· Dr-Irv opened on Jul 24, 2025

· 

2.3.2

BUG: <code>Index</code> 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

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

Status: Open.

#61937 In pandas-dev/pandas;

· Dr-Irv opened on Jul 24, 2025

BUG: <code>assert_index_equal(CategoricalIndex, CategoricalIndex, check_categorical=True, exact=False)</code> raises TypeError instead of AssertionError

Bug

Testingpandas testing functions or related to the test suitepandas testing functions or related to the test suite

Status: Open.

#61935 In pandas-dev/pandas;

· mroeschke opened on Jul 24, 2025

BUG: Merge fails on pyarrow datetime columns

Arrowpyarrow functionalitypyarrow functionality

Bug

DatetimeDatetime data dtypeDatetime data dtype

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

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

Status: Open.

#61926 In pandas-dev/pandas;

· Meet1995 opened on Jul 23, 2025

BUG: Add min/max methods to ArrowExtensionArray GH#61311

Arrowpyarrow functionalitypyarrow functionality

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 61924

#61924 In pandas-dev/pandas;

· skonda29 opened on Jul 22, 2025

BUG: IntervalIndex.unique() only contains the first interval if all interval borders are negative

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

IntervalInterval data typeInterval data type

Status: Open (in progress).

pandas-dev/pandasnumber 61920

#61920 In pandas-dev/pandas;

· khemkaran10 opened on Jul 22, 2025

BUG: <code>IntervalIndex.unique()</code> only contains the first interval if all interval borders are negative

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

IntervalInterval data typeInterval data type

Status: Open.

#61917 In pandas-dev/pandas;

· johannes-mueller opened on Jul 21, 2025