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API: setitem-with-expansion casting

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

setitem-with-expansion

Status: Open.

#62369 In pandas-dev/pandas;

· jbrockmendel opened on Sep 17, 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/Behavior Internal Consistency of API/Behavior

Bug

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

StringsString extension data type and string data String extension data type and string data

Status: Open.

#62240 In pandas-dev/pandas;

· sam-s opened on Sep 2, 2025

·

3.0

ENH: Consistent <code>name</code> property for the iterates in <code>DataFrameGroupBy</code>

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Bug

Enhancement

Groupby

Status: Open.

#62141 In pandas-dev/pandas;

· FelixBenning opened on Aug 18, 2025

BUG: series.groupby(level=0) and series.groupby(pd.Grouper(level=0)) produce different orders

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Bug

Groupby

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

Status: Open.

#61943 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Jul 25, 2025

API: boolean ops with float dtype

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

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

Nullable by defaultIssues that would be addressed by moving to nullable-by-default Issues that would be addressed by moving to nullable-by-default

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#61881 In pandas-dev/pandas;

· jbrockmendel opened on Jul 16, 2025

ENH: the error behaviour in pandas operation should be consistent rename erros are ignore by default whereas drop erros are raise

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Enhancement

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

Status: Open.

#61681 In pandas-dev/pandas;

· Furqan-s opened on Jun 20, 2025

BUG(string dtype): Arithmetic operations between Series with string dtype index

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Bug

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

StringsString extension data type and string data String extension data type and string data

Status: Open.

#61425 In pandas-dev/pandas;

· rhshadrach opened on May 10, 2025

BUG: Inconsistent index type when using read_csv with string[pyarrow] dtype

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Bug

IO CSVread_csv, to_csv read_csv, to_csv

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

Status: Open.

#61145 In pandas-dev/pandas;

· ptth222 opened on Mar 19, 2025

Improve the apply/map APIs

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

API Design

ApplyApply, Aggregate, Transform, Map Apply, Aggregate, Transform, Map

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

Status: Open.

#61128 In pandas-dev/pandas;

· datapythonista opened on Mar 15, 2025

BUG: inconsistent return types from __getitem__ vs iteration

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Bug

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

Status: Open.

#60560 In pandas-dev/pandas;

· gboeing opened on Dec 13, 2024

BUG: <code>transform("cumcount")</code> returns a Series instead of a Dataframe.

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Bug

Groupby

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

Status: Open.

#60551 In pandas-dev/pandas;

· ClaudioSalvatoreArcidiacono opened on Dec 12, 2024

BUG?: using <code>None</code> as replacement value in <code>replace()</code> typically upcasts to object dtype

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

Bug

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

replacereplace method replace method

Status: Open.

#60284 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 12, 2024