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BUG: DataFrame.explode fails with str dtype

Bug

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

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

Status: Merged (completed).

pandas-dev/pandasnumber 61623

#61623 In pandas-dev/pandas;

· by rhshadrach was closed on Jun 24, 2025

· 

2.3.1

BUG(string dtype): groupby/resampler.min/max returns float on all NA strings

Bug

Groupby

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

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

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

Status: Merged (completed).

pandas-dev/pandasnumber 60985

#60985 In pandas-dev/pandas;

· by rhshadrach was closed on Apr 19, 2025

· 

2.3

REGR: DataFrame.transpose resulting in not contiguous data on nullable EAs

Bug

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

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

Status: Merged (completed).

pandas-dev/pandasnumber 57474

#57474 In pandas-dev/pandas;

· by rhshadrach was closed on Feb 18, 2024

· 

2.2.1

BUG: DataFrame.stack sorting index values in rare cases

Bug

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

Status: Closed (completed).

#53824 In pandas-dev/pandas;

· by rhshadrach was closed on Jun 28, 2023

· 

2.1

DEPR: DataFrame.stack on columns containing duplicate values

Bug

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

Status: Closed (completed).

#53761 In pandas-dev/pandas;

· by rhshadrach was closed on Aug 3, 2023

BUG: DataFrame.stack with <code>sort=True</code> and unsorted MultiIndex levels

Bug

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

Status: Closed (completed).

#53636 In pandas-dev/pandas;

· by rhshadrach was closed on Jun 13, 2023

REGR: SeriesGroupBy.agg with multiple categoricals, as_index=False, and a list fails

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

Bug

CategoricalCategorical Data TypeCategorical Data Type

Groupby

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

Status: Merged (completed).

pandas-dev/pandasnumber 52850

#52850 In pandas-dev/pandas;

· by rhshadrach was closed on Apr 22, 2023

· 

2.0.1

BUG: groupby.describe on a frame with duplicate column names

Bug

Groupby

Status: Merged (completed).

pandas-dev/pandasnumber 50846

#50846 In pandas-dev/pandas;

· by rhshadrach was closed on Feb 3, 2023

· 

2.0

BUG: DataFrameGroupBy.value_counts fails with a TimeGrouper

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

Groupby

Status: Closed (completed).

#50486 In pandas-dev/pandas;

· by rhshadrach was closed on Jan 3, 2023

REGR: groupby.size with axis=1 doesn't return a Series

Bug

Groupby

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

Status: Merged (completed).

pandas-dev/pandasnumber 48760

#48760 In pandas-dev/pandas;

· by rhshadrach was closed on Sep 26, 2022

· 

1.5.1

REGR: Adding a row via DataFrame.at

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Needs TestsUnit test(s) needed to prevent regressionsUnit test(s) needed to prevent regressions

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

Status: Closed (completed).

#48296 In pandas-dev/pandas;

· by rhshadrach was closed on Sep 1, 2022

· 

1.5

BUG: Some str reducers fail in Groupby.transform with axis=1

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

Bug

Groupby

Status: Closed (completed).

#45986 In pandas-dev/pandas;

· by rhshadrach was closed on Jul 14, 2023