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TRACKER: new default String dtype (pyarrow-backed, numpy NaN semantics)

API Design

Arrowpyarrow functionalitypyarrow functionality

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

Status: Open.

#54792 In pandas-dev/pandas;

· jorisvandenbossche opened on Aug 28, 2023

RLS: 3.0

Release

Status: Open.

#57064 In pandas-dev/pandas;

· datapythonista opened on Jan 25, 2024

DEPR: pd.concat special cases DatetimeIndex to sort even when sort=False

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

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

Status: Open.

#57335 In pandas-dev/pandas;

· lukemanley opened on Feb 10, 2024

API: Make <code>Series.array</code> a read-only NumpyExtensionEA when applicable

Copy / view semantics

Status: Open.

#58007 In pandas-dev/pandas;

· mroeschke opened on Mar 26, 2024

API: timestamp resolution inference - default to one unit (if possible) instead of being data-dependent?

DatetimeDatetime data dtypeDatetime data dtype

Non-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolution

Timestamppd.Timestamp and associated methodspd.Timestamp and associated methods

Status: Open.

#58989 In pandas-dev/pandas;

· jorisvandenbossche opened on Jun 12, 2024

ENH/BUG: pd.date_range() still defaults to nanosecond resolution

Non-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolution

Status: Open.

#59031 In pandas-dev/pandas;

· jorisvandenbossche opened on Jun 17, 2024

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

TST (string dtype): clean-up interpolate tests

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

Stale

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

Testingpandas testing functions or related to the test suitepandas testing functions or related to the test suite

Status: Open (in progress).

pandas-dev/pandasnumber 60653

#60653 In pandas-dev/pandas;

· jorisvandenbossche opened on Jan 3, 2025

API / COW: ensure every new Series/DataFrame also has new (shallow copy) index

API Design

Copy / view semantics

Stale

Status: Draft (not ready).

pandas-dev/pandasnumber 53699

#53699 In pandas-dev/pandas;

· jorisvandenbossche opened on Jun 16, 2023

ENH: Need API support and __repr__ to discover the storage used for strings

Enhancement

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

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

Status: Open.

#59342 In pandas-dev/pandas;

· arnaudlegout opened on Jul 29, 2024

TST: assert reading of legacy pickles against current data

IO Pickleread_pickle, to_pickleread_pickle, to_pickle

Stale

Testingpandas testing functions or related to the test suitepandas testing functions or related to the test suite

Status: Open (in progress).

pandas-dev/pandasnumber 61792

#61792 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 7, 2025

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

Copy-on-Write (PDEP-7) follow-up overview issue

Copy / view semantics

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

Status: Open.

#48998 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 7, 2022

BUG/API: round-tripping non-nano datetime64s with to_json/read_json

Bug

IO JSONread_json, to_json, json_normalizeread_json, to_json, json_normalize

Non-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolution

Status: Open.

#55827 In pandas-dev/pandas;

· jbrockmendel opened on Nov 4, 2023

BUG: pd.Timestamp() defaults to [s] resolution instead of [ns]

Docs

Non-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolution

Status: Open.

#52653 In pandas-dev/pandas;

· Rob-DL opened on Apr 13, 2023

ENH: Added <code>DataFrame.nsorted</code> to select top <code>n</code> rows according to column-dependent order

Enhancement

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

Status: Open (in progress).

pandas-dev/pandasnumber 61457

#61457 In pandas-dev/pandas;

· MartinBraquet opened on May 19, 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

BUG: Behavior change in pandas 3.x with <code>Series.resample</code> and <code>closed="right", how="right"</code>

Bug

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

Resampleresample methodresample method

Status: Open.

#62200 In pandas-dev/pandas;

· TomAugspurger opened on Aug 26, 2025

BUG: str.match and str.contains behave inconsistently on compiled regexps (regression in 2.3.2 relative to 2.3.1)

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

Bug

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

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

Status: Open.

#62240 In pandas-dev/pandas;

· sam-s opened on Sep 2, 2025

CoW: add readonly flag to ExtensionArrays, return read-only EA/ndarray in .array/EA.to_numpy()

Copy / view semantics

Status: Open (in progress).

pandas-dev/pandasnumber 61925

#61925 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 22, 2025

REF: consistent ndarray-wrapping for lists in arithmetic ops

Status: Open (in progress).

pandas-dev/pandasnumber 62552

#62552 In pandas-dev/pandas;

· jbrockmendel opened on Oct 2, 2025

BUG: Categorical(Series[object]) not preserving categories.dtype as object

Status: Open (in progress).

pandas-dev/pandasnumber 62757

#62757 In pandas-dev/pandas;

· jbrockmendel opened on Oct 19, 2025