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PERF: <code>DataFrame.unstack()</code> and <code>DataFrame.pivot_table()</code> upcasting take up more memory than needed

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

PerformanceMemory or execution speed performance Memory or execution speed performance

Status: Open.

#62244 In pandas-dev/pandas;

· pabloknecht opened on Sep 3, 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

BUG: writing categorical of intervals (pd.cut() output) to Parquet is not supported

IntervalInterval data type Interval data type

IO Parquetparquet, feather parquet, feather

Status: Open.

#62235 In pandas-dev/pandas;

· jorisvandenbossche opened on Sep 2, 2025

API: <code>freq</code> or <code>step</code> for base class Index?

Status: Open.

#62219 In pandas-dev/pandas;

· jbrockmendel opened on Aug 29, 2025

ENH: Infer enums as categories

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.

#62207 In pandas-dev/pandas;

· JensHeinrich opened on Aug 28, 2025

BUG: <code>record_prefix</code> ignored when <code>record_path</code> is empty

Bug

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.

#62205 In pandas-dev/pandas;

· JensHeinrich opened on Aug 28, 2025

BUG: Behavior change in pandas 3.x with <code>Series.resample</code> and <code>closed="right", how="right"</code>

Bug

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.

#62200 In pandas-dev/pandas;

· TomAugspurger opened on Aug 26, 2025

DOC: NaT - "alias of NaT"; NA - "alias of &lt;NA&gt;"

Docs

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.

#62185 In pandas-dev/pandas;

· wjandrea opened on Aug 25, 2025

BUG: Index.get_level_values() does not handle boolean, pd.NA, np.nan, or pd.NaT <code>level</code> correctly

Bug

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.

#62169 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Aug 21, 2025

REF: use _cast_pointwise_result in map

Status: Open.

#62164 In pandas-dev/pandas;

· jbrockmendel opened on Aug 21, 2025

DOC: date_range/timedelta_range confusing 3 out of 4 arguments note

Docs

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.

#62161 In pandas-dev/pandas;

· loicdiridollou opened on Aug 20, 2025

API: indexing dates-with-datetime64

Bug

DatetimeDatetime data dtype Datetime data dtype

IndexRelated to the Index class or subclasses Related to the Index class or subclasses

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

Status: Open.

#62158 In pandas-dev/pandas;

· jbrockmendel opened on Aug 20, 2025