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BUG: read_excel() converts the string "None" in an Excel file to "NaN"

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.

#61788 In pandas-dev/pandas;

· jmcnamara opened on Jul 5, 2025

ENH: Add Coefficient of Variation to DataFrame.describe()

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.

#61784 In pandas-dev/pandas;

· ffaa1234 opened on Jul 5, 2025

PERF: Unnecessary string interning in read_csv?

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61783 In pandas-dev/pandas;

· jbrockmendel opened on Jul 5, 2025

BUG: Errors using pyarrow datetime types on windows

Arrowpyarrow functionalitypyarrow functionality

Bug

DatetimeDatetime data dtypeDatetime data dtype

Docs

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

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

WindowsWindows OSWindows OS

Status: Open.

#61782 In pandas-dev/pandas;

· Liam3851 opened on Jul 5, 2025

DOC: Typo within <code>Series.mask()</code> docs - alignment is done between self and cond, not cond and other

Docs

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

Status: Open.

#61781 In pandas-dev/pandas;

· nickodell opened on Jul 4, 2025

BUG: tz_localize(None) with Arrow timestamp

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

TimezonesTimezone data dtypeTimezone data dtype

Status: Open.

#61780 In pandas-dev/pandas;

· jbrockmendel opened on Jul 4, 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

API/BUG: different constructor behavior for numpy vs pyarrow dt64tzs

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

Arrowpyarrow functionalitypyarrow functionality

Bug

Status: Open.

#61775 In pandas-dev/pandas;

· jbrockmendel opened on Jul 4, 2025

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

Bug

Groupby

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

Status: Open.

#61772 In pandas-dev/pandas;

· kay-ou opened on Jul 3, 2025

BUG: StringDtype objects from pandas &lt;2.3.0 cannot be reliably unpickled in 2.3.0.

Bug

IO Pickleread_pickle, to_pickleread_pickle, to_pickle

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

Status: Open.

#61763 In pandas-dev/pandas;

· Liam3851 opened on Jul 2, 2025

 ·  

2.3.1

BUG: user expected pd.isna to be False for NaNs with Float64Dtype

Bug

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

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#61758 In pandas-dev/pandas;

· abhmul opened on Jul 2, 2025

PERF: Arrow dtypes are much slower than Numpy for DataFrame.apply

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

Arrowpyarrow functionalitypyarrow functionality

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61747 In pandas-dev/pandas;

· ehsantn opened on Jun 30, 2025