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BUG: inconsistency with missing values comparison

Bug

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

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

Status: Open.

#63328 In pandas-dev/pandas;

· lbraglia opened on Dec 11, 2025

BUG(pandas 3.0 regression): <code>drop(index=...)</code> doesn't accept NA values when using arrow dtype in index

Arrowpyarrow functionalitypyarrow functionality

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

Status: Open.

#63304 In pandas-dev/pandas;

· tswast opened on Dec 8, 2025

·  

3.0

BUG: Inconsistent behavior of Groupby with None values with filter (#…

Filterse.g. head, tail, nthe.g. head, tail, nth

Groupby

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

Status: Open (in progress).

pandas-dev/pandasnumber 63178

#63178 In pandas-dev/pandas;

· koskampt opened on Nov 23, 2025

API: consistently preserve null values for <code>**0</code> in nullable dtypes

API Design

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

NA - MaskedArraysRelated to pd.NA and nullable extension arraysRelated to pd.NA and nullable extension arrays

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

Status: Open.

#63094 In pandas-dev/pandas;

· MarcoGorelli opened on Nov 12, 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: StringArray with NA behaves different to numpy object array for elementwise comparisons

Bug

Compatpandas objects compatability with Numpy or Python functionspandas objects compatability with Numpy or Python functions

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

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

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#62802 In pandas-dev/pandas;

· ssche opened on Oct 22, 2025

BUG: Series with NA values are replaced with NaN when mapping over categorial data with a default providing dictionary

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

Bug

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

Status: Open.

#62710 In pandas-dev/pandas;

· Jake-Moss opened on Oct 16, 2025

API/DEPR: disallow casting nan-float to bool

Bug

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

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

Status: Open.

#62687 In pandas-dev/pandas;

· jbrockmendel opened on Oct 14, 2025

Backport PR #62313 on branch 2.3.x (DOC: Fix NaT and NA API docs)

Docs

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

Stale

Status: Open (in progress).

pandas-dev/pandasnumber 62521

#62521 In pandas-dev/pandas;

· meeseeksmachine opened on Sep 30, 2025

·  

2.3.4

BUG: Inconsistent behavior of Groupby with None values with filter

Bug

Filterse.g. head, tail, nthe.g. head, tail, nth

Groupby

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

Status: Open.

#62501 In pandas-dev/pandas;

· chiiyeh opened on Sep 29, 2025

BUG: Inconsistent behavior surrounding pd.fillna

Bug

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

Status: Open.

#61568 In pandas-dev/pandas;

· anna-intellegens opened on Jun 5, 2025

ENH: Add warning when <code>DataFrame.groupby</code> drops NA keys

Enhancement

Groupby

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

Status: Open.

#61339 In pandas-dev/pandas;

· tehunter opened on Apr 22, 2025