Search results

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

· Updated on Jul 8, 2025

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

Status: Open.

#60159 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 31, 2024

· Updated on Jul 2, 2025

· 

3.0

BUG: fix: <code>list</code> as index item does not raise

Bug

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

Status: Open (in progress).

pandas-dev/pandasnumber 61674

#61674 In pandas-dev/pandas;

· Andre-Andreati opened on Jun 17, 2025

· Updated on Jun 23, 2025

API: Index.__array_wrap__ stop special-casing bool dtype

API Design

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

Status: Open.

#52676 In pandas-dev/pandas;

· jbrockmendel opened on Apr 14, 2023

· Updated on Jun 2, 2025

API: with CoW, should every new Series/DataFrame object also have its own new Index objects?

API Design

Copy / view semantics

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

Status: Open.

#53721 In pandas-dev/pandas;

· jorisvandenbossche opened on Jun 19, 2023

· Updated on Jun 2, 2025

BUG: pandas 2.2.0 <code>DataFrame.groupby</code> regression when group labels of type <code>pd.Timestamp</code>

Bug

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

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

TimezonesTimezone data dtypeTimezone data dtype

Status: Open.

#57192 In pandas-dev/pandas;

· maread99 opened on Feb 1, 2024

· Updated on Jun 2, 2025

BUG: when using id_vars in .melt(), the id_vars does not recognize the column name in a multiIndex dataframe

Bug

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

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

Status: Open.

#60018 In pandas-dev/pandas;

· ivan-marroquin opened on Oct 11, 2024

· Updated on May 5, 2025

BUG: <code>series.reindex(mi)</code> behaves different for series with Index and MultiIndex

Bug

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

MultiIndex

Status: Open.

#60923 In pandas-dev/pandas;

· ssche opened on Feb 13, 2025

· Updated on Mar 6, 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

· Updated on Feb 19, 2025

API: handling of missing values in Index.__contains__

API - ConsistencyInternal Consistency of API/BehaviorInternal Consistency of API/Behavior

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

Status: Open.

#59765 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 9, 2024

· Updated on Jan 26, 2025

· 

4.0

BUG: is_unique fails when using float128 indexes, since pandas 2.0

Bug

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.

#59826 In pandas-dev/pandas;

· morotti opened on Sep 17, 2024

· Updated on Sep 22, 2024

BUG (regression): <code>Enum</code> (and subclasses) no longer acceptable parameter type for <code>columns</code>

Bug

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

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

Status: Open.

#54386 In pandas-dev/pandas;

· posita opened on Aug 3, 2023

· Updated on Jul 17, 2024