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BUG: read_csv with pyarrow engine cannot handle single-line CSV files

Arrowpyarrow functionalitypyarrow functionality

Bug

IO CSVread_csv, to_csvread_csv, to_csv

Status: Open.

#62635 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 9, 2025

TRACKER: add support for Python 3.14

Master TrackerHigh level tracker for similar issuesHigh level tracker for similar issues

Python 3.14

Status: Open.

#62261 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 5, 2025

· 

3.0

BUG: writing categorical of intervals (pd.cut() output) to Parquet is not supported

IntervalInterval data typeInterval data type

IO Parquetparquet, featherparquet, feather

Status: Open.

#62235 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 2, 2025

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

· 

3.0

String dtype: backwards compatibility of selecting "object" vs "str" columns in <code>select_dtypes</code>

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#61916 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 21, 2025

· 

3.0

BUG?: creating Categorical from pandas Index/Series with "object" dtype infers string

CategoricalCategorical Data TypeCategorical Data Type

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Status: Open.

#61778 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 4, 2025

· 

3.0

ENH: show the raw unicode in the output formatting of Index/array?

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

UnicodeUnicode stringsUnicode strings

Status: Open.

#60819 In pandas-dev/pandas;

· jorisvandenbossche opened on Jan 30, 2025

DOC (string dtype): update user guide page "Working with text data"

Docs

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#60348 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 17, 2024

· 

3.0

API: how to check for "logical" equality of dtypes?

API Design

Status: Open.

#60305 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 13, 2024

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

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

BUG/API: preserve dtype in Index <code>append()</code>

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

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

StringsString extension data type and string dataString extension data type and string data

Void Dtypedtype for no-data casesdtype for no-data cases

Status: Open.

#60159 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 31, 2024

· 

4.0