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ENH: Backport free-threading support to 2.3

Enhancement

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

Python 3.13

Status: Open.

#61844 In pandas-dev/pandas;

· crusaderky opened on Jul 13, 2025

BUG: .rolling().mean() returns all NaNs on re-execution, despite .copy() use

Bug

Needs InfoClarification about behavior needed to assess issueClarification about behavior needed to assess issue

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#61841 In pandas-dev/pandas;

· DavidZatica opened on Jul 12, 2025

ENH: Include line number and number of fields when read_csv() callable raises ParserWarning

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.

#61838 In pandas-dev/pandas;

· matthewgottlieb opened on Jul 12, 2025

BUG: read_csv() on_bad_lines callable does not raise ParserWarning when index_col is set

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.

#61837 In pandas-dev/pandas;

· matthewgottlieb opened on Jul 12, 2025

ENH: error message context.

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.

#61834 In pandas-dev/pandas;

· hunterhogan opened on Jul 12, 2025

ENH: Add a function like PYQT signal

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.

#61829 In pandas-dev/pandas;

· an-unimportant-person opened on Jul 11, 2025

PERF: Brainstorming read_csv perf improvements

IO CSVread_csv, to_csvread_csv, to_csv

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.

#61825 In pandas-dev/pandas;

· jbrockmendel opened on Jul 10, 2025

BUG: drop doesn't recognise MultiIndexes

Bug

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

IO Pickleread_pickle, to_pickleread_pickle, to_pickle

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

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