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API: copy np.ndarray inputs to Index subclass constructors by default

API Design

Copy / view semantics

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Status: Open.

#63388 In pandas-dev/pandas;

· mroeschke opened on Dec 16, 2025

·  

3.0

BUG: string replace results in invalid regular expression: invalid perl operator: (?<=

Arrowpyarrow functionalitypyarrow functionality

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

Status: Open.

#63385 In pandas-dev/pandas;

· jorisvandenbossche opened on Dec 16, 2025

·  

3.0

DOC: the default value of <code>engine</code> argument in <code>eval</code> should be <code>None</code>

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.

#63376 In pandas-dev/pandas;

· cmp0xff opened on Dec 16, 2025

ENH: Vectorization (e.g. SIMD) in pandas' Hashtable Operations for Performance Improvement

Enhancement

Status: Open.

#63374 In pandas-dev/pandas;

· 113xiaoji opened on Dec 16, 2025

ENH: Fixed-length strings in read_csv

Enhancement

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

Status: Open.

#63373 In pandas-dev/pandas;

· pulkin opened on Dec 15, 2025

BUG: (pandas 3.0rc0) <code>str.cat</code> is not retaining <code>index</code> dtype

Bug

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

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

Status: Open.

#63371 In pandas-dev/pandas;

· galipremsagar opened on Dec 15, 2025

·  

3.0

BUG: inconsistency with missing values comparison

Bug

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

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

Status: Open.

#63328 In pandas-dev/pandas;

· lbraglia opened on Dec 11, 2025

BUG: Division results in 0 values for large dfs with numpy==2.3.5

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.

#63320 In pandas-dev/pandas;

· tilyevsky12 opened on Dec 10, 2025

BUG: <code>DataFrame.apply(axis='columns')</code> loses pyarrow-backed dtypes / does not preserve dtype_backend

ApplyApply, Aggregate, Transform, MapApply, Aggregate, Transform, Map

Bug

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

pyarrow dtype retentionop with pyarrow dtype -> expect pyarrow resultop with pyarrow dtype -> expect pyarrow result

Status: Open.

#63317 In pandas-dev/pandas;

· mattharrison opened on Dec 9, 2025

BUG: large pivot_table has incorrect output with Python 3.14

Bug

Python 3.14

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

Status: Open.

#63314 In pandas-dev/pandas;

· joshuanapoli opened on Dec 9, 2025

·  

3.0

BUG(pandas 3.0 regression): <code>drop(index=...)</code> doesn't accept NA values when using arrow dtype in index

Arrowpyarrow functionalitypyarrow functionality

Bug

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#63304 In pandas-dev/pandas;

· tswast opened on Dec 8, 2025

·  

3.0

ENH: Persian date

Enhancement

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

Status: Open.

#63299 In pandas-dev/pandas;

· ShimaBeiranvand opened on Dec 8, 2025