Search results

BUG: Inconsistent behavior of Groupby with None values with filter

Bug

Filterse.g. head, tail, nthe.g. head, tail, nth

Groupby

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

Status: Open.

#62501 In pandas-dev/pandas;

· chiiyeh opened on Sep 29, 2025

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

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

Bug

Groupby

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

Status: Open.

#61943 In pandas-dev/pandas;

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

BUG: <code>rank</code> gives incorrect outputs on Windows with PyArrow backend

Bug

Groupby

Transformationse.g. cumsum, diff, ranke.g. cumsum, diff, rank

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

Status: Open.

#61896 In pandas-dev/pandas;

· MarcoGorelli opened on Jul 18, 2025

BUG: Calling dict(df.groupby(...)) raises TypeError: 'str' object is not callable despite valid inputs

Bug

Groupby

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

Status: Open.

#61772 In pandas-dev/pandas;

· kay-ou opened on Jul 3, 2025

BUG: way to include all columns within a groupby apply

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

Bug

Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

Groupby

Status: Open.

#61406 In pandas-dev/pandas;

· madelavar12 opened on May 8, 2025

ENH: Add warning when <code>DataFrame.groupby</code> drops NA keys

Enhancement

Groupby

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

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

Status: Open.

#61339 In pandas-dev/pandas;

· tehunter opened on Apr 22, 2025

ENH: Accept no fields for groupby by

Enhancement

Groupby

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

Status: Open.

#61160 In pandas-dev/pandas;

· simonaubertbd opened on Mar 21, 2025

BUG: Dropped Index Name on Aggregated Index Column with MultiIndexed DataFrame

Bug

Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

Groupby

Status: Open.

#60603 In pandas-dev/pandas;

· RahimD opened on Dec 24, 2024

BUG: Arrow Struct columns cannot be grouped on (ArrowNotImplementedError)

Arrowpyarrow functionalitypyarrow functionality

Bug

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

Groupby

Status: Open.

#60594 In pandas-dev/pandas;

· a-reich opened on Dec 20, 2024

API: pass <code>ddof</code> down to Cythonised <code>std</code> / <code>var</code> in <code>groupby.agg</code>

API Design

Groupby

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

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#60591 In pandas-dev/pandas;

· MarcoGorelli opened on Dec 20, 2024

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

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

Bug

Groupby

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

Status: Open.

#60551 In pandas-dev/pandas;

· ClaudioSalvatoreArcidiacono opened on Dec 12, 2024