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API: Breaking Changes in 3.0 (without deprecations)

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

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

Status: Open.

#44823 In pandas-dev/pandas;

· jbrockmendel opened on Dec 8, 2021

DEPR: List of deprecations to be removed in 3.0

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

Status: Open.

#50578 In pandas-dev/pandas;

· datapythonista opened on Jan 5, 2023

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

DEPR (PDEP-7/CoW): deprecate and remove <code>copy</code> keyword (except in constructors)

Copy / view semantics

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

Status: Open.

#56022 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 17, 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

Deprecate <code>future.no_silent_downcasting</code>

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

Status: Open.

#57403 In pandas-dev/pandas;

· phofl opened on Feb 13, 2024

BUG: FutureWarning when splitting a dataframe using <code>np.split</code>

BlockerBlocking issue or pull request for an upcoming releaseBlocking issue or pull request for an upcoming release

Compatpandas objects compatability with Numpy or Python functionspandas objects compatability with Numpy or Python functions

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

Status: Open.

#57351 In pandas-dev/pandas;

· amanlai opened on Feb 11, 2024

BUG: groupby.agg should always agg

API Design

ApplyApply, Aggregate, Transform, MapApply, Aggregate, Transform, Map

Enhancement

Groupby

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

Status: Open (in progress).

pandas-dev/pandasnumber 57706

#57706 In pandas-dev/pandas;

· rhshadrach opened on Mar 2, 2024

Potential regression induced by PR #56921

PerformanceMemory or execution speed performanceMemory or execution speed performance

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

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

Status: Open.

#57641 In pandas-dev/pandas;

· DeaMariaLeon opened on Feb 27, 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

Potential regression induced by commit 924f246

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

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

Status: Open.

#58285 In pandas-dev/pandas;

· rhshadrach opened on Apr 17, 2024

Potential regression induced by "Refactored pandas_timedelta_to_timedeltastruct"

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

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

Status: Open.

#57951 In pandas-dev/pandas;

· DeaMariaLeon opened on Mar 21, 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

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

Status: Open.

#60159 In pandas-dev/pandas;

· jorisvandenbossche opened on Oct 31, 2024

BUG: inferring the future string dtype doesn't work for pyarrow's "large_string" type

Arrowpyarrow functionalitypyarrow functionality

Bug

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

Status: Open.

#54798 In pandas-dev/pandas;

· jorisvandenbossche opened on Aug 28, 2023

Change default string storage from "python" to "pyarrow" (if installed) for for NA-variant of StringDtype

API Design

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

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

Status: Open.

#60287 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 12, 2024

BLD: Drop Python 3.10 support

BuildLibrary building on various platformsLibrary building on various platforms

DependenciesRequired and optional dependenciesRequired and optional dependencies

Python 3.10

Status: Open.

#60059 In pandas-dev/pandas;

· wirable23 opened on Oct 16, 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

BUG: groupby.agg with UDF changing pyarrow dtypes

Bug

Groupby

pyarrow dtype retentionop with pyarrow dtype -> expect pyarrow resultop with pyarrow dtype -> expect pyarrow result

Stale

Status: Open (in progress).

pandas-dev/pandasnumber 59601

#59601 In pandas-dev/pandas;

· rhshadrach opened on Aug 25, 2024

ENH: Implement PDEP-17

Enhancement

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

Status: Open (in progress).

pandas-dev/pandasnumber 61468

#61468 In pandas-dev/pandas;

· rhshadrach opened on May 20, 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

BUG: Pandas 2.2 breaks SQLAlchemy 1.4 compatibility

Compatpandas objects compatability with Numpy or Python functionspandas objects compatability with Numpy or Python functions

DependenciesRequired and optional dependenciesRequired and optional dependencies

IO SQLto_sql, read_sql, read_sql_queryto_sql, read_sql, read_sql_query

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

Status: Open.

#57049 In pandas-dev/pandas;

· miraculixx opened on Jan 24, 2024