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BUG: Take method of NumpyExtensionArray now returns another extension array with the correct dtype.

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

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

Status: Open (in progress).

pandas-dev/pandasnumber 62502

#62502 In pandas-dev/pandas;

· aijams opened on Sep 29, 2025

BUG: NumpyEA[uint8].take([-1], allow_fill=True) nonsense result

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

Status: Open.

#62448 In pandas-dev/pandas;

· jbrockmendel opened on Sep 25, 2025

BUG: factorize does not preserve extension dtypes

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

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.

#62337 In pandas-dev/pandas;

· batterseapower opened on Sep 14, 2025

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

Stale

Status: Open (in progress).

pandas-dev/pandasnumber 61920

#61920 In pandas-dev/pandas;

· khemkaran10 opened on Jul 22, 2025

BUG: <code>IntervalIndex.unique()</code> 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

ENH: Consistent NA handling in <code>unique()</code>, and <code>nunique()</code>

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Enhancement

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

Status: Open.

#61209 In pandas-dev/pandas;

· olek-osikowicz opened on Mar 31, 2025

ENH: Should groupby's <code>value_counts</code> sorts on <code>count</code> before <code>proportion</code> is computed

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Enhancement

Groupby

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

Status: Open.

#59725 In pandas-dev/pandas;

· sfc-gh-joshi opened on Sep 5, 2024

BUG: Can not select in MultiIndex with NaN

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

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

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#56366 In pandas-dev/pandas;

· moi90 opened on Dec 6, 2023

DEPR: DataFrame.value_counts(sort=False) sorts

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

Status: Open.

#56007 In pandas-dev/pandas;

· rhshadrach opened on Nov 16, 2023

BUG: pd.Series.describe ignores include, exclude arguments

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Describe/info

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

Status: Open.

#54193 In pandas-dev/pandas;

· natalymr opened on Jul 19, 2023

BUG: Axial inconsistency of pandas.diff

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

Status: Open.

#52579 In pandas-dev/pandas;

· psads-git opened on Apr 10, 2023

PERF: groupby.value_counts

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Enhancement

Groupby

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#51750 In pandas-dev/pandas;

· rhshadrach opened on Mar 3, 2023