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BUG: Inconsistent runtime typing for Index[num] * list[timestamp]

Bug

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

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

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

Status: Open.

#62524 In pandas-dev/pandas;

· cmp0xff opened on Sep 30, 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

API: <code>freq</code> or <code>step</code> for base class Index?

API Design

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

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

Status: Open.

#62219 In pandas-dev/pandas;

· jbrockmendel opened on Aug 29, 2025

BUG: Index.get_level_values() does not handle boolean, pd.NA, np.nan, or pd.NaT <code>level</code> correctly

Bug

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

Status: Open.

#62169 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Aug 21, 2025

API: indexing dates-with-datetime64

Bug

DatetimeDatetime data dtypeDatetime data dtype

datetime.datestdlib datetime.date supportstdlib datetime.date support

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

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

Status: Open.

#62158 In pandas-dev/pandas;

· jbrockmendel opened on Aug 20, 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

Status: Open.

#61937 In pandas-dev/pandas;

· Dr-Irv opened on Jul 24, 2025

BUG: union of MultiIndex throws exception for datetime and pd.Timestamp with identical values

Bug

DatetimeDatetime data dtypeDatetime data dtype

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

Status: Open.

#61807 In pandas-dev/pandas;

· jwg4 opened on Jul 7, 2025

BUG: Index[Float64].insert(1, False) casts False to 0

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

Status: Open.

#61709 In pandas-dev/pandas;

· jbrockmendel opened on Jun 26, 2025

BUG: <code>Index.drop_duplicates()</code> is inconsistent for unhashable values

Bug

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

Status: Open.

#60925 In pandas-dev/pandas;

· camriddell opened on Feb 13, 2025

BUG: MultiIndex union/difference not commutative

Bug

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

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

MultiIndex

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

setopsunion, intersection, difference, symmetric_differenceunion, intersection, difference, symmetric_difference

Status: Open.

#60642 In pandas-dev/pandas;

· ssche opened on Jan 2, 2025

BUG: set_index with pyarrow timestamp type does not produce DatetimeIndex

Arrowpyarrow functionalitypyarrow functionality

Bug

DatetimeDatetime data dtypeDatetime data dtype

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

Status: Open.

#60561 In pandas-dev/pandas;

· WillAyd opened on Dec 13, 2024

BUG/API: preserve dtype in Index <code>append()</code>

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

Void Dtypedtype for no-data casesdtype for no-data cases

Status: Open.

#60159 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 31, 2024

· 

4.0