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BUG: drop doesn't recognise MultiIndexes

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.

#61823 In pandas-dev/pandas;

· pratt-fds opened on Jul 10, 2025

BUG: Series created from pre-2.1 legacy pickles lose their names during .copy operations

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.

#61819 In pandas-dev/pandas;

· Liam3851 opened on Jul 9, 2025

ENH: Add Polars engine to read_csv

good first issue

IO CSVread_csv, to_csvread_csv, to_csv

Status: Open.

#61813 In pandas-dev/pandas;

· datapythonista opened on Jul 8, 2025

BUG: Dataframe.aggregate drops pyarrow backend for lambda aggregation functions

Arrowpyarrow functionalitypyarrow functionality

Bug

pyarrow dtype retentionop with pyarrow dtype -> expect pyarrow resultop with pyarrow dtype -> expect pyarrow result

Status: Open.

#61812 In pandas-dev/pandas;

· flori-ko opened on Jul 8, 2025

DOC: Lacking information on error type raised by pd.to_numeric

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.

#61811 In pandas-dev/pandas;

· ericludvigs opened on Jul 8, 2025

BUG: Pandas Series with Xarray slow print time.

Bug

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#61809 In pandas-dev/pandas;

· chaoyupeng opened on Jul 8, 2025

BUG: union of MultiIndex throws exception for datetime and pd.Timestamp with identical values

Bug

DatetimeDatetime data dtypeDatetime data dtype

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Status: Open.

#61807 In pandas-dev/pandas;

· jwg4 opened on Jul 7, 2025

BUG: Errors using pyarrow datetime types on windows

Arrowpyarrow functionalitypyarrow functionality

Bug

DatetimeDatetime data dtypeDatetime data dtype

Docs

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

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

Bug

Groupby

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

Status: Open.

#61772 In pandas-dev/pandas;

· kay-ou opened on Jul 3, 2025