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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

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

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

BUG: DataFrame.min with skipna=True raises TypeError when column contains np.nan and datetime.date

Bug

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

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

Status: Open.

#61204 In pandas-dev/pandas;

· tanjt107 opened on Mar 31, 2025

BUG: Performance issue with fillna() after merging DataFrames

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

Needs InfoClarification about behavior needed to assess issueClarification about behavior needed to assess issue

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61180 In pandas-dev/pandas;

· sjfakharian opened on Mar 26, 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: Series.mask incorrectly replaces positions of pd.NA in the cond argument

Arrowpyarrow functionalitypyarrow functionality

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

Status: Open.

#60729 In pandas-dev/pandas;

· kartoria opened on Jan 18, 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?: using <code>None</code> as replacement value in <code>replace()</code> typically upcasts to object dtype

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

Bug

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

replacereplace methodreplace method

Status: Open.

#60284 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 12, 2024

ENH: Add <code>area_limit</code> to `fillna

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

Status: Open.

#60161 In pandas-dev/pandas;

· joshdunnlime opened on Oct 31, 2024