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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: <code>pandas.array</code> works fine when 2-D array contains string

Bug

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

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

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.

#63112 In pandas-dev/pandas;

· antareepsarkar opened on Nov 14, 2025

BUG: Pandas Series with Xarray slow print time.

Bug

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

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

Output-Formatting__repr__ of pandas objects, to_string__repr__ of pandas objects, to_string

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61809 In pandas-dev/pandas;

· chaoyupeng opened on Jul 8, 2025

BUG: doing df.to_parquet and then reading it with pd.read_parquet causes KeyError

Bug

IO Parquetparquet, featherparquet, feather

MultiIndex

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.

#61714 In pandas-dev/pandas;

· elbg opened on Jun 26, 2025

BUG: DataFrame.to_markdown exception when a cell has numpy.array type

Bug

DependenciesRequired and optional dependenciesRequired and optional dependencies

IO DataIO issues that don't fit into a more specific labelIO issues that don't fit into a more specific label

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

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.

#61337 In pandas-dev/pandas;

· omarsaad98 opened on Apr 22, 2025

BUG: setting item to iterable with .at fails when column doesn't exist or has wrong dtype

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

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.

#61223 In pandas-dev/pandas;

· jbogar opened on Apr 3, 2025

BUG: setting column with 2D object array raises

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.).

Status: Open.

#61026 In pandas-dev/pandas;

· tonyyuyiding opened on Mar 1, 2025

Support for Storing and Retrieving Complex Data Types (e.g., Embeddings) in Pandas DataFrames

Enhancement

IO CSVread_csv, to_csvread_csv, to_csv

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.

#60895 In pandas-dev/pandas;

· ashishjaimongeorge opened on Feb 9, 2025

BUG: Inconsistent implicit conversion of 1-arrays inside data frames

Bug

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

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.

#57923 In pandas-dev/pandas;

· erezinman opened on Mar 20, 2024

BUG: Setting a numpy array as a column in Pandas uses only the first column of the array.

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

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.

#57765 In pandas-dev/pandas;

· kgourgou opened on Mar 7, 2024

BUG: .loc operation cannot locate existing index when having single string as index for dataframe ('string',)

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

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.

#57750 In pandas-dev/pandas;

· carlonlv opened on Mar 6, 2024

BUG: pd.to_sql fails with an ARRAY of composites

Bug

IO SQLto_sql, read_sql, read_sql_queryto_sql, read_sql, read_sql_query

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.

#54651 In pandas-dev/pandas;

· sergiykhan opened on Aug 20, 2023