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BUG: indexing a MultiIndex-ed DataFrame (only) with a scalar on a level and a slice on another doesn't drop a level

Bug

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

MultiIndex

Status: Open.

#62926 In pandas-dev/pandas;

· toobaz opened on Oct 30, 2025

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

BUG: Inconsistent behaviour when merging reset-ed MultiIndex dataframe

Bug

MultiIndex

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

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

Status: Open.

#62150 In pandas-dev/pandas;

· renkeven opened on Aug 20, 2025

BUG: doing df.to_parquet and then reading it with pd.read_parquet causes KeyError

Bug

IO Parquetparquet, featherparquet, feather

MultiIndex

Nested DataData where the values are collections (lists, sets, dicts, objects, etc.).Data where the values are collections (lists, sets, dicts, objects, etc.).

Status: Open.

#61714 In pandas-dev/pandas;

· elbg opened on Jun 26, 2025

DOC: change <code>tuples</code> param for MultiIndex.from_tuples from sequence to iterable

Docs

MultiIndex

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

Status: Open.

#61357 In pandas-dev/pandas;

· yangdanny97 opened on Apr 25, 2025

BUG: remove_unused_levels does not keep index levels order

Bug

MultiIndex

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

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

Status: Open.

#61245 In pandas-dev/pandas;

· mathman79 opened on Apr 7, 2025

BUG: <code>ValueError: Length of values (5) does not match length of index (4)</code> when subtracting two series with MultIndex and Index and nan values

Bug

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

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

MultiIndex

Status: Open.

#60908 In pandas-dev/pandas;

· ssche opened on Feb 11, 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

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

Status: Open.

#60642 In pandas-dev/pandas;

· ssche opened on Jan 2, 2025

BUG: user defined function does not work with <code>DataFrame.apply</code>

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

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

Bug

MultiIndex

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

Status: Open.

#59908 In pandas-dev/pandas;

· shobsi opened on Sep 27, 2024

BUG: inconsistency when <code>read_csv</code> reads MultiIndex with empty values

Bug

IO CSVread_csv, to_csvread_csv, to_csv

MultiIndex

Status: Open.

#59560 In pandas-dev/pandas;

· ldouteau opened on Aug 20, 2024