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BUG: Th lines skipped by pd.read_csv(path, chunksize=n, on_bad_lines='skip') depends on n.

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.

#61973 In Pandas-dev/Pandas;

· alexbra1 opened on Jul 27, 2025

DOC: code coverage app provided in documentation is invalid

Docs

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

Status: Open.

#61968 In Pandas-dev/Pandas;

· eicchen opened on Jul 26, 2025

DOC: shift argument in Series.shift() is not used

Docs

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

Status: Open.

#61955 In Pandas-dev/Pandas;

· Dr-Irv opened on Jul 25, 2025

1 comment

BUG: Using Series.str.fullmatch() and Series.str.match() 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

1

2 comments

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

3 comments



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

2 comments



DOC: Standardize noncompliant docstrings in pandas/io/html.py (flake8-docstrings)

Docs

Needs InfoClarification about behavior needed to assess issueClarification about behavior needed to assess issue

Status: Open.

#61944 In Pandas-dev/Pandas;

· gumus-g opened on Jul 25, 2025

5 comments

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

1 comment

BUG: Using Series.str.contains() 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: Using / operator with a Path and Series of string dtype fails

Enhancement

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

Status: Open.

#61940 In Pandas-dev/Pandas;

· Dr-Irv opened on Jul 24, 2025

· 

2.3.2

2 comments

DOC: Docstring for BooleanDType inconsistent with the rest of repo

Docs

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

Status: Open.

#61939 In Pandas-dev/Pandas;

· saguaro1234 opened on Jul 24, 2025

BUG: metadata on np.ndarray of np.dtype("O") dtype lost when roundtripped through pandas.Series

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

Status: Open.

#61938 In Pandas-dev/Pandas;

· ilan-gold opened on Jul 24, 2025

2 comments

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

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

4 comments

BUG: assert_index_equal(CategoricalIndex, CategoricalIndex, check_categorical=True, exact=False) 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

PERF: DataFrame.copy(deep=True) returns a view on the original pyarrow buffer

Copy / view semantics

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61930 In Pandas-dev/Pandas;

· TomAugspurger opened on Jul 23, 2025

9 comments

indexing with a Categorical of Intervals is inefficient

CategoricalCategorical Data TypeCategorical Data Type

IntervalInterval data typeInterval data type

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61928 In Pandas-dev/Pandas;

· flying-sheep opened on Jul 23, 2025

3 comments

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

5 comments

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.

#61917 In Pandas-dev/Pandas;

· johannes-mueller opened on Jul 21, 2025

1

3 comments

String dtype: backwards compatibility of selecting "object" vs "str" columns in select_dtypes

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

· 

2.3.2

2 comments

BUG: Convertors not running when reading a dataframe from excel using calamine engine

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.

#61914 In Pandas-dev/Pandas;

· ramadanomar opened on Jul 20, 2025

2 comments

BUG: rank gives incorrect outputs on Windows with PyArrow backend

Bug

Groupby

Transformationse.g. cumsum, diff, ranke.g. cumsum, diff, rank

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

Status: Open.

#61896 In Pandas-dev/Pandas;

· MarcoGorelli opened on Jul 18, 2025

3 comments

Output formatting: the repr of the Categorical categories (quoted or unquoted strings?)

CategoricalCategorical Data TypeCategorical Data Type

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

Output-Formatting__repr__ of pandas objects, to_string__repr__ of pandas objects, to_string

Status: Open.

#61890 In Pandas-dev/Pandas;

· jorisvandenbossche opened on Jul 17, 2025

6 comments

ENH: Images embedded in cells. The DISPIMG function of WPS

Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

Enhancement

Needs InfoClarification about behavior needed to assess issueClarification about behavior needed to assess issue

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

Status: Open.

#61888 In Pandas-dev/Pandas;

· lunavexxx opened on Jul 17, 2025

10 comments

API: boolean ops with float dtype

API - ConsistencyInternal Consistency of API/BehaviorInternal Consistency of API/Behavior

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

Numeric OperationsArithmetic, Comparison, and Logical operationsArithmetic, Comparison, and Logical operations

Status: Open.

#61881 In Pandas-dev/Pandas;

· jbrockmendel opened on Jul 16, 2025

3 comments

BUG: Operations not implemented for non-1D ExtensionArrays

Bug

NA - MaskedArraysRelated to pd.NA and nullable extension arraysRelated to pd.NA and nullable extension arrays

Numeric OperationsArithmetic, Comparison, and Logical operationsArithmetic, Comparison, and Logical operations

Status: Open.

#61866 In Pandas-dev/Pandas;

· eicchen opened on Jul 15, 2025

2

3 comments