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API/BUG: .loc tuple ambiguity with MultiIndex when nlevels == ndim

API Design

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

MultiIndex

Status: Open.

#65326 In pandas-dev/pandas;

· jbrockmendel opened on Apr 21, 2026

MultiIndex: inconsistent 'mixed depth' squeezing behavior across axes, NA types, and operations

API Design

MultiIndex

Status: Open.

#65324 In pandas-dev/pandas;

· jbrockmendel opened on Apr 21, 2026

ENH: df.duplicated() default behavior should default to tagging all duplicates as True

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.

#65320 In pandas-dev/pandas;

· griffinjmbur opened on Apr 21, 2026

BUG: DataFrame/Series.rename silently downcasts nullable index/column dtypes to NumPy dtypes

Bug

ExtensionArrayExtending pandas with custom dtypes or arrays.Extending pandas with custom dtypes or arrays.

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

Status: Open.

#65315 In pandas-dev/pandas;

· gautamvarmadatla opened on Apr 21, 2026

BUG: pyarrow engine timestamp conversion fails when doing pd.read_csv

Usage Question

Status: Open.

#65308 In pandas-dev/pandas;

· pradipneupane opened on Apr 20, 2026

BUILD: Fails with meson 1.11.0

BuildLibrary building on various platformsLibrary building on various platforms

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

Status: Open.

#65252 In pandas-dev/pandas;

· michael-o opened on Apr 15, 2026

ENH: pd.crosstab with normalize='index' and margins=True drops the marginal 'Total' column.

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.

#65249 In pandas-dev/pandas;

· creilly94010 opened on Apr 15, 2026

BUG: read_csv() into FloatingArrays converts np.nan into pd.NA, even with distinguish_nan_and_na=True

Bug

IO CSVread_csv, to_csvread_csv, to_csv

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

Status: Open.

#65237 In pandas-dev/pandas;

· carlocastoldi opened on Apr 14, 2026

BUG: DataFrame.agg([...], numeric_only=True) returns NaN for non-numeric columns instead of excluding them

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

Bug

Status: Open.

#65218 In pandas-dev/pandas;

· gautamvarmadatla opened on Apr 13, 2026

API: Index.take discards fill_value and raises unnecessarily

Bug

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

Status: Open.

#65210 In pandas-dev/pandas;

· jbrockmendel opened on Apr 13, 2026

PERF: Specify how when calling merge._factorize_keys when possible

PerformanceMemory or execution speed performanceMemory or execution speed performance

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

Status: Open.

#65160 In pandas-dev/pandas;

· rhshadrach opened on Apr 10, 2026

BUG: Regression - df[key] = df[key] / x silently drops assignment on MultiIndex columns with mixed-dtype level and single sub-column

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

MultiIndex

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

Status: Open.

#65118 In pandas-dev/pandas;

· aukeschaap opened on Apr 8, 2026

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3.0.3