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BUG: <code>pd.concat()</code> produces invalid index when inputs have <code>Int64Dtype</code> index with <code>NA</code>s

Bug

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

MultiIndex

Status: Open.

#62903 In pandas-dev/pandas;

· jlumpe opened on Oct 29, 2025

BUG: <code>sort_index</code> failing on MultiIndex with label name when key is used

Bug

MultiIndex

Sortinge.g. sort_index, sort_valuese.g. sort_index, sort_values

Status: Open.

#62361 In pandas-dev/pandas;

· ldouteau opened on Sep 17, 2025

BUG: NaN categorical in multi-level column gets replaced in to_excel output

Bug

IO Excelread_excel, to_excelread_excel, to_excel

MultiIndex

Status: Open.

#62340 In pandas-dev/pandas;

· niclas-muller opened on Sep 14, 2025

Improve MultiIndex label rename checks

Bug

MultiIndex

Stale

Status: Closed (abandoned).

pandas-dev/pandasnumber 61769

#61769 In pandas-dev/pandas;

· by TabLand was closed on Oct 5, 2025

BUG: Fix MultiIndex from_tuples on tuples with NaNs

Bug

MultiIndex

Status: Merged (completed).

pandas-dev/pandasnumber 60944

#60944 In pandas-dev/pandas;

· by Anurag-Varma was closed on Mar 7, 2025

· 

3.0

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

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

Status: Open.

#60642 In pandas-dev/pandas;

· ssche opened on Jan 2, 2025

BUG: .duplicated() ignoring duplicates for MultiIndex

Bug

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

MultiIndex

Status: Closed (completed).

#60236 In pandas-dev/pandas;

· by mmatous was closed on Nov 29, 2024

BUG: Enlarging multilevel index fails if one or more level keys are None

Bug

good first issue

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

MultiIndex

Needs TestsUnit test(s) needed to prevent regressionsUnit test(s) needed to prevent regressions

setitem-with-expansion

Status: Open.

#59153 In pandas-dev/pandas;

· micky-gee opened on Jul 1, 2024

BUG: Let <code>melt</code> name multiple variable columns for labels from a <code>MultiIndex</code>

MultiIndex

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

Status: Merged (completed).

pandas-dev/pandasnumber 58088

#58088 In pandas-dev/pandas;

· by rob-sil was closed on May 25, 2024

BUG: DataFrame slice selection treated as hashable in Python 3.12 #57500

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

MultiIndex

Status: Merged (completed).

pandas-dev/pandasnumber 58043

#58043 In pandas-dev/pandas;

· by tehunter was closed on Apr 16, 2024

· 

2.3.4

DOC: Fixing GL08 errors for pandas.ExcelFile.sheet_names and pandas.MultiIndex.codes

CIContinuous IntegrationContinuous Integration

Docs

IO Excelread_excel, to_excelread_excel, to_excel

MultiIndex

Status: Merged (completed).

pandas-dev/pandasnumber 57601

#57601 In pandas-dev/pandas;

· by thomasdamcevski was closed on Feb 27, 2024

· 

3.0

BUG: Improve MultiIndex label rename checks, docs and tests

Bug

MultiIndex

Stale

Status: Closed (abandoned).

pandas-dev/pandasnumber 56936

#56936 In pandas-dev/pandas;

· by TabLand was closed on Mar 26, 2024