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BUG: <code>assert_series_equal</code> broken with <code>check_category_order=False</code> for arrays with null values

Bug

CategoricalCategorical Data TypeCategorical Data Type

Status: Open.

#62008 In pandas-dev/pandas;

· fjetter opened on Jul 31, 2025

BUG: Avoid copying categorical codes if <code>copy=False</code>

CategoricalCategorical Data TypeCategorical Data Type

Status: Open (in progress).

pandas-dev/pandasnumber 62000

#62000 In pandas-dev/pandas;

· fjetter opened on Jul 30, 2025

indexing with a <code>Categorical</code> of <code>Interval</code>s is inefficient

CategoricalCategorical Data TypeCategorical Data Type

IntervalInterval data typeInterval data type

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61928 In pandas-dev/pandas;

· flying-sheep opened on Jul 23, 2025

Output formatting: the repr of the Categorical categories (quoted or unquoted strings?)

CategoricalCategorical Data TypeCategorical Data Type

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

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

Status: Open.

#61890 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 17, 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

· 

3.0

BUG: mapping categorical with single category to boolean returns category instead of bool dtype

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

Bug

CategoricalCategorical Data TypeCategorical Data Type

Status: Open.

#61719 In pandas-dev/pandas;

· kdebrab opened on Jun 27, 2025

BUG: DataFrame.join(other) raises InvalidIndexError if column index is CategoricalIndex

Bug

CategoricalCategorical Data TypeCategorical Data Type

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: Open.

#61675 In pandas-dev/pandas;

· tvoipio opened on Jun 18, 2025

· 

2.3.2

DEPR: Make <code>dtype="category"</code> always imply ordered=False

CategoricalCategorical Data TypeCategorical Data Type

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

Status: Open.

#61074 In pandas-dev/pandas;

· mroeschke opened on Mar 7, 2025

ENH: Add the <code>observed</code> parameter to <code>get_dummies</code>

CategoricalCategorical Data TypeCategorical Data Type

Enhancement

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

Status: Open.

#60585 In pandas-dev/pandas;

· alonme opened on Dec 17, 2024

BUG: Parquet roundtrip fails with numerical categorical dtype

Bug

CategoricalCategorical Data TypeCategorical Data Type

IO Parquetparquet, featherparquet, feather

Status: Open.

#60491 In pandas-dev/pandas;

· adrienpacifico opened on Dec 4, 2024

API: <code>astype</code> method fails to raise errors for <code>category</code> data type

API Design

CategoricalCategorical Data TypeCategorical Data Type

Status: Open.

#59899 In pandas-dev/pandas;

· noahblakesmith opened on Sep 26, 2024

BUG: Column of dtype Categorical in DataFrame encounters error when taking a row that includes nan in the column

Bug

CategoricalCategorical Data TypeCategorical Data Type

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

Status: Open.

#58954 In pandas-dev/pandas;

· cinntamani opened on Jun 7, 2024