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BUG: Unexpected Code Segment Executed, Causing Logical Error

Bug

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

Status: Open.

#61932 In pandas-dev/pandas;

· LAUNAHC opened on Jul 24, 2025

PERF: <code>DataFrame.copy(deep=True)</code> returns a view on the original pyarrow buffer

Copy / view semantics

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61930 In pandas-dev/pandas;

· TomAugspurger opened on Jul 23, 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

DOC: Add tzdata to dependencies section in README

Docs

Status: Open.

#61927 In pandas-dev/pandas;

· n-dett opened on Jul 23, 2025

BUG: Merge fails on pyarrow datetime columns

Arrowpyarrow functionalitypyarrow functionality

Bug

DatetimeDatetime data dtypeDatetime data dtype

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

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

Status: Open.

#61926 In pandas-dev/pandas;

· Meet1995 opened on Jul 23, 2025

BUG: <code>IntervalIndex.unique()</code> only contains the first interval if all interval borders are negative

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

Bug

IntervalInterval data typeInterval data type

Status: Open.

#61917 In pandas-dev/pandas;

· johannes-mueller opened on Jul 21, 2025

String dtype: backwards compatibility of selecting "object" vs "str" columns in <code>select_dtypes</code>

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

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

Status: Open.

#61916 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 21, 2025

· 

3.0

BUG: Cannot interpret string dtype as a valid data type

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

Status: Open.

#61915 In pandas-dev/pandas;

· jeremiedbb opened on Jul 21, 2025

BUG: Convertors not running when reading a dataframe from excel using calamine engine

Bug

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

Status: Open.

#61914 In pandas-dev/pandas;

· ramadanomar opened on Jul 20, 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

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: make to_json with JSON Table Schema work correctly with string dtype

Bug

IO JSONread_json, to_json, json_normalizeread_json, to_json, json_normalize

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

Status: Open.

#61889 In pandas-dev/pandas;

· jorisvandenbossche opened on Jul 17, 2025

· 

3.0