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BUG: Boolean Column Indexing Issue in Pandas

Bug

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

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

Status: Open.

#61980 In pandas-dev/pandas;

· tanjt107 opened on Jul 28, 2025

BUG: The lines skipped by pd.read_csv(path, chunksize=n, on_bad_lines='skip') depends on <code>n</code>.

Bug

IO CSVread_csv, to_csvread_csv, to_csv

Status: Open.

#61973 In pandas-dev/pandas;

· alexbra1 opened on Jul 27, 2025

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

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