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BUG/API: to_json with non-nano TimedeltaIndex

Bug

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

Status: Open.

#63236 In pandas-dev/pandas;

· jbrockmendel opened on Nov 30, 2025

BUG: Deprecation warnings with option_context have incorrect stacklevel

Bug

WarningsWarnings that appear or should be added to pandasWarnings that appear or should be added to pandas

Status: Open.

#63235 In pandas-dev/pandas;

· rhshadrach opened on Nov 30, 2025

BUG: SettingWithCopyWarning is not shown with copy-on-write disabled

Bug

Copy / view semantics

Status: Open.

#63230 In pandas-dev/pandas;

· Streep opened on Nov 29, 2025

BUG: Trying to add an object with __iter__ but no __len__ using .loc[row, col] fails

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

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

Status: Open.

#63225 In pandas-dev/pandas;

· mgunyho opened on Nov 28, 2025

BUG: PyArrow string: list indexing and negative indices fail after str.split()

Arrowpyarrow functionalitypyarrow functionality

Bug

Nested DataData where the values are collections (lists, sets, dicts, objects, etc.).Data where the values are collections (lists, sets, dicts, objects, etc.).

Status: Open.

#63221 In pandas-dev/pandas;

· Elliottt-Chen opened on Nov 27, 2025

BUG: Inconsistent behavior with groupby and copy-on-write

Bug

Copy / view semantics

Groupby

Status: Open.

#63219 In pandas-dev/pandas;

· rhshadrach opened on Nov 27, 2025

API: provide (advanced) utility to update (swap) the underlying array of a Series in-place

API Design

Copy / view semantics

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

Status: Open.

#63215 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 26, 2025

DOC: <code>Index.putmask</code> can accept more than <code>np.ndarray[bool]</code> for <code>mask</code>

Docs

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Status: Open.

#63209 In pandas-dev/pandas;

· cmp0xff opened on Nov 26, 2025

BUG: Unexpected <code>TypeError</code> for subclasses of <code>np.ndarray</code> in <code>comparison_op</code>

Bug

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

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

Status: Open.

#63205 In pandas-dev/pandas;

· Julian-Harbeck opened on Nov 26, 2025

DOC: <code>name</code> in <code>Index.to_frame</code> is claimed to default to <code>index.name</code>

Docs

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

Status: Open.

#63191 In pandas-dev/pandas;

· cmp0xff opened on Nov 24, 2025

BUG: <code>.loc[:, [*labels]]</code> inconsistently reorders <code>MultiIndex</code>ed <code>Series</code> and <code>DataFrame</code>s

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

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

Sortinge.g. sort_index, sort_valuese.g. sort_index, sort_values

Status: Open.

#63187 In pandas-dev/pandas;

· QuaternionsRock opened on Nov 24, 2025

BUG: Arrow duration reduction consistency

Arrowpyarrow functionalitypyarrow functionality

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

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

Status: Open.

#63170 In pandas-dev/pandas;

· rhshadrach opened on Nov 21, 2025