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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

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

Status: Open.

#61949 In pandas-dev/pandas;

· JonahDelman opened on Jul 25, 2025

BUG: Replacement fails after NA value with PyArrow-backed strings

Arrowpyarrow functionalitypyarrow functionality

Bug

replacereplace methodreplace method

Status: Open.

#61948 In pandas-dev/pandas;

· rhshadrach opened on Jul 25, 2025

· 

2.3.2

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

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

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.

#61942 In pandas-dev/pandas;

· Dr-Irv opened on Jul 24, 2025

BUG: Using <code>/</code> operator with a <code>Path</code> and <code>Series</code> of strings containing pyarrow strings fails

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.

#61940 In pandas-dev/pandas;

· Dr-Irv opened on Jul 24, 2025

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: <code>metadata</code> on <code>np.ndarray</code> of <code>np.dtype("O")</code> dtype lost when roundtripped through <code>pandas.Series</code>

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

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

PERF: <code>DataFrame.copy(deep=True)</code> 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