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BUG / API: setitem on pandas object fails if underlying numpy array is read-only

API Design

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

Status: Open.

#62144 In pandas-dev/pandas;

· jorisvandenbossche opened on Aug 19, 2025

·  

3.1

ERR: consistent error messages for unsupported setitem values

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

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

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

Status: Open.

#60218 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 6, 2024

PDEP-6 (setitem casting): Clarify how do decide when a setitem would upcast (and thus error in the future) or not

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

Status: Open.

#55935 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 13, 2023

API: DataFrame setitem: setting columns with a DataFrame RHS doesn't align column names?

API Design

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

Indexing alignmentCases when an argument to a loc.__[sg]etitem__ is a frame/series and the alignment may be ambiguousCases when an argument to a loc.__[sg]etitem__ is a frame/series and the alignment may be ambiguous

Status: Open.

#46974 In pandas-dev/pandas;

· jorisvandenbossche opened on May 9, 2022

ENH: Support ExtensionArray (and masked EAs speficially) in indexing

Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

Enhancement

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

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

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

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

Status: Open.

#39133 In pandas-dev/pandas;

· jorisvandenbossche opened on Jan 12, 2021

API: alignment behaviour of Series as assignment value in indexing

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

Bug

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

Indexing alignmentCases when an argument to a loc.__[sg]etitem__ is a frame/series and the alignment may be ambiguousCases when an argument to a loc.__[sg]etitem__ is a frame/series and the alignment may be ambiguous

Status: Open.

#37516 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 30, 2020

API: require scalar result from the scalar .at indexer

API Design

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.

#33153 In pandas-dev/pandas;

· jorisvandenbossche opened on Mar 30, 2020

BUG: assignment with enlargement gives object dtype with ExtensionArrays

Bug

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

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

setitem-with-expansion

Status: Open.

#32346 In pandas-dev/pandas;

· jorisvandenbossche opened on Feb 29, 2020

BUG: wrong errors when indexing with list that includes pd.NA

Bug

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

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

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

Status: Open.

#31948 In pandas-dev/pandas;

· jorisvandenbossche opened on Feb 13, 2020

REGR: assigning scalar with a length no longer works

Bug

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

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

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#26333 In pandas-dev/pandas;

· jorisvandenbossche opened on May 10, 2019

API: should Series.get be strictly label based or allow positional?

API Design

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.

#17928 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 20, 2017

API: should reindex on a level introduce NaNs for missing entries per label of other levels?

API Design

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

MultiIndex

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

Status: Open.

#12319 In pandas-dev/pandas;

· jorisvandenbossche opened on Feb 13, 2016