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API: NaN vs NA in mixed reduction

Bug

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#62024 In pandas-dev/pandas;

· jbrockmendel opened on Aug 2, 2025

· Updated on Aug 16, 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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#59765 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 9, 2024

· Updated on Aug 14, 2025

· 

4.0

BUG: Inconsistent .values NA/NaN

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#61856 In pandas-dev/pandas;

· jbrockmendel opened on Jul 14, 2025

· Updated on Jul 30, 2025

BUG: isna() does not catch np.NaN when datatype is Float64

Bug

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

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#60106 In pandas-dev/pandas;

· mortnstak opened on Oct 25, 2024

· Updated on Jul 23, 2025

BUG: user expected pd.isna to be False for NaNs with Float64Dtype

Bug

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#61758 In pandas-dev/pandas;

· abhmul opened on Jul 2, 2025

· Updated on Jul 16, 2025

BUG: Nullable Float64Dtype incorrectly converting NaN to NA when constructed with Arrow array

Bug

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#55668 In pandas-dev/pandas;

· tswast opened on Oct 24, 2023

· Updated on Jul 15, 2025

BUG: numpy_nullable NaNs do not round-trip through CSV

Bug

IO CSVread_csv, to_csvread_csv, to_csv

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#61617 In pandas-dev/pandas;

· jbrockmendel opened on Jun 9, 2025

· Updated on Jul 10, 2025

BUG: mix of int and pd.NA defaults to object dtype

ConstructorsSeries/DataFrame/Index/pd.array ConstructorsSeries/DataFrame/Index/pd.array Constructors

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Enhancement

ExtensionArrayExtending pandas with custom dtypes or arrays.Extending pandas with custom dtypes or arrays.

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

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#33662 In pandas-dev/pandas;

· eddy-geek opened on Apr 19, 2020

· Updated on Jun 13, 2025

BUG: NA are coerced in to NaN by concat

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

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

Status: Open.

#61303 In pandas-dev/pandas;

· davetapley opened on Apr 17, 2025

· Updated on Apr 19, 2025

BUG: reindex (and atleast several other methods) do not respect fill_value=None

Bug

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#61291 In pandas-dev/pandas;

· TimAllen576 opened on Apr 15, 2025

· Updated on Apr 16, 2025

API: distinguish NA vs NaN in floating dtypes

API Design

Enhancement

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#32265 In pandas-dev/pandas;

· jorisvandenbossche opened on Feb 26, 2020

· Updated on Feb 28, 2025

BUG: skipna=True operations don't skip NaN in FloatingArrays

Bug

ExtensionArrayExtending pandas with custom dtypes or arrays.Extending pandas with custom dtypes or arrays.

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#59965 In pandas-dev/pandas;

· carlocastoldi opened on Oct 4, 2024

· Updated on Dec 9, 2024