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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: 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: df.replace() with list of regex sometimes fails with column of null objects

Bug

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

replacereplace methodreplace method

Status: Open.

#54399 In pandas-dev/pandas;

· zaneselvans opened on Aug 4, 2023

BUG: <code>fillna</code> specify duplicated column that is MultiIndex causes RecursionError

Bug

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

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

MultiIndex

Status: Open.

#53498 In pandas-dev/pandas;

· yuji38kwmt opened on Jun 2, 2023

BUG: <code>pd.isnull</code> treats <code>list</code> and <code>tuple</code> input differently

Bug

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

Status: Open.

#52283 In pandas-dev/pandas;

· jrbourbeau opened on Mar 29, 2023

BUG: <code>Series.replace</code> converts <code>np.nan</code> into <code>pd.NaT</code> implicitly

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

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

replacereplace methodreplace method

Status: Open.

#48034 In pandas-dev/pandas;

· ng-henry opened on Aug 11, 2022

ENH: Series Mapping <code>na_action=ignore</code> result is misleading.

Enhancement

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

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

SeriesSeries data structureSeries data structure

Status: Open.

#47262 In pandas-dev/pandas;

· chapmanderek opened on Jun 7, 2022

BUG: Inconsistent assignment of <code>NAT</code> values to datetime columns in <code>MultiIndex</code>

Bug

DatetimeDatetime data dtypeDatetime data dtype

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

MultiIndex

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

TimedeltaTimedelta data typeTimedelta data type

Status: Open.

#43351 In pandas-dev/pandas;

· galipremsagar opened on Sep 1, 2021

BUG: Series.fillna is altering None values of unspecified columns

Bug

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

SeriesSeries data structureSeries data structure

Status: Open.

#40498 In pandas-dev/pandas;

· RSchweiger opened on Mar 18, 2021

BUG: Series.plot.bar() raises TypeError on timedelta dtype

Bug

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

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

TimedeltaTimedelta data typeTimedelta data type

Visualizationplottingplotting

Status: Open.

#39320 In pandas-dev/pandas;

· darkdragon-001 opened on Jan 21, 2021

ERR: DataFrame.fillna with non-unique mapping

Docs

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

replacereplace methodreplace method

Status: Open.

#36608 In pandas-dev/pandas;

· dsaxton opened on Sep 24, 2020

API Consistency: validations on no-ops

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

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

Status: Open.

#36466 In pandas-dev/pandas;

· jbrockmendel opened on Sep 19, 2020