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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

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: raise error when converting <code>NaT</code> to int

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 62479

#62479 In pandas-dev/pandas;

· Alvaro-Kothe opened on Sep 27, 2025

TST: add fillna test for filling with Categorical

CategoricalCategorical Data TypeCategorical Data Type

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

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

Status: Open (in progress).

pandas-dev/pandasnumber 62319

#62319 In pandas-dev/pandas;

· thaiv28 opened on Sep 11, 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: Add fillna at the beginning of _where not to fill NA. #60729

Bug

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 60772

#60772 In pandas-dev/pandas;

· sanggon6107 opened on Jan 23, 2025