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Pull requests: pandas-dev/pandas

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Pull requests list

BUG: ArrowDtype timestamp setitem silently crossed the tz-aware/naive boundary Arrow pyarrow functionality Bug Indexing Related to indexing on series/frames, not to indexes themselves Timezones Timezone data dtype
#69029 opened Sep 19, 2026 by jbrockmendel Member • Draft
BUG: Index.insert silently truncating a value into a sparse subtype Bug Dtype Conversions Unexpected or buggy dtype conversions Index Related to the Index class or subclasses Sparse Sparse Data Type
#69028 opened Sep 19, 2026 by jbrockmendel Member • Draft
BUG: SparseArray.fillna mishandled a datetimelike fill value Bug Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Sparse Sparse Data Type
#69027 opened Sep 19, 2026 by jbrockmendel Member • Draft
BUG: replace silently discards a compiled regex on ArrowDtype strings Arrow pyarrow functionality Bug Strings String extension data type and string data
#69026 opened Sep 19, 2026 by jbrockmendel Member • Draft
BUG: DataFrame.duplicated self-triggering the .values deprecation Bug Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Warnings Warnings that appear or should be added to pandas
#69025 opened Sep 19, 2026 by jbrockmendel Member Loading…
BUG: factorize trusted a pre-encoded pyarrow dictionary Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Arrow pyarrow functionality Bug
#69024 opened Sep 19, 2026 by jbrockmendel Member • Draft
DOC: select_dtypes told users to select strings with the object dtype (GH#54898) Arrow pyarrow functionality Docs Strings String extension data type and string data
#69023 opened Sep 19, 2026 by jbrockmendel Member • Draft
1
BUG: to_parquet (pyarrow) deletes a pre-existing file it cannot open Bug IO Parquet parquet, feather
#69022 opened Sep 19, 2026 by jbrockmendel Member • Draft
TST: cover _get_join_keys int64-overflow recursion (GH#58517) Awaiting Review PR in the maintainers' court; exempt from staleness
#69020 opened Sep 18, 2026 by MichaelFowler1 Loading…
5 of 8 tasks
TST: add regression test for DBAPI params pass-through (GH#11683) Awaiting Review PR in the maintainers' court; exempt from staleness
#69019 opened Sep 18, 2026 by MichaelFowler1 Loading…
5 of 8 tasks
1
PERF: raise the default parallel read_csv worker cap to 6 IO CSV read_csv, to_csv Performance Memory or execution speed performance
#69017 opened Sep 18, 2026 by jbrockmendel Member Loading… 3.1
BUG: round first bin edge to precision in cut/qcut with include_lowest Awaiting Review PR in the maintainers' court; exempt from staleness
#69016 opened Sep 18, 2026 by ethanstoner Contributor Loading…
7 of 9 tasks
2
BUG: preserve assertion errors for nested sequence length mismatches Awaiting Review PR in the maintainers' court; exempt from staleness
#69015 opened Sep 18, 2026 by Ai-Eastern Loading…
6 of 8 tasks
1
Parquet chunksize Awaiting Review PR in the maintainers' court; exempt from staleness
#69013 opened Sep 18, 2026 by davidob05 Loading…
7 of 8 tasks
1
BUG: omit hidden cells from Styler.to_typst Awaiting Review PR in the maintainers' court; exempt from staleness
#68991 opened Sep 18, 2026 by baba9811 Loading…
4 tasks done
1
BUG: read_sas held a SAS7BDAT file open until a cyclic collection Bug IO SAS SAS: read_sas
#68973 opened Sep 17, 2026 by jbrockmendel Member Loading…
BUG: sparse cumsum propagated a stored missing value instead of skipping it (GH#68187) Bug Sparse Sparse Data Type
#68972 opened Sep 17, 2026 by jbrockmendel Member Loading…
Revert "BUG: out-of-range scalar setitem into a numpy-nullable array silently wrapped (GH#48867)"
#68971 opened Sep 17, 2026 by jbrockmendel Member Loading…
Fix to_html href escaping when render_links and escape are both enabled Awaiting Review PR in the maintainers' court; exempt from staleness
#68968 opened Sep 17, 2026 by dafahaha Loading…
1
Handle re.error in regex compilation and fix return Awaiting Review PR in the maintainers' court; exempt from staleness
#68960 opened Sep 17, 2026 by MaddipatlaChetan24 Loading…
6 of 7 tasks
API: Add reduction methods to base ExtensionArray Awaiting Review PR in the maintainers' court; exempt from staleness
#68959 opened Sep 17, 2026 by Julian-Harbeck Contributor Loading…
7 of 8 tasks
1
10
BUG: to_datetime returned category dtype for categorical input when the cache fired (GH#28629) Bug Categorical Categorical Data Type Datetime Datetime data dtype
#68945 opened Sep 16, 2026 by jbrockmendel Member Loading…
1
DEPR: Timestamp.timestamp treating tz-naive as UTC (GH#50298) Deprecate Functionality to remove in pandas Needs Discussion Requires discussion from core team before further action Timestamp pd.Timestamp and associated methods Timezones Timezone data dtype
#68939 opened Sep 16, 2026 by jbrockmendel Member Loading…
1
BUG: read_csv with engine="pyarrow" ignored skiprows when header is not None (GH#48507) Arrow pyarrow functionality Bug IO CSV read_csv, to_csv
#68938 opened Sep 16, 2026 by jbrockmendel Member • Draft
2
DEPR: rename Groupby classes to GroupBy (GH#49578) API - Consistency Internal Consistency of API/Behavior Deprecate Functionality to remove in pandas Groupby Resample resample method Window rolling, ewma, expanding
#68937 opened Sep 16, 2026 by jbrockmendel Member Loading…
1
ProTip! Exclude everything labeled bug with -label:bug.