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Pull requests: pandas-dev/pandas

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Pull requests list

Backport PR #65931 on branch 3.0.x (TST: compat with matplotlib 3.11 log-axis tick changes) Testing pandas testing functions or related to the test suite Visualization plotting
#65936 opened Jun 22, 2026 by meeseeksmachine Contributor Loading… 3.0.4
Bump pypa/cibuildwheel from 3.4.1 to 4.1.0 CI Continuous Integration Dependencies Required and optional dependencies
#65934 opened Jun 22, 2026 by dependabot Bot Loading…
REF: route object-dtype parser fallbacks through _string_convert IO CSV read_csv, to_csv Refactor Internal refactoring of code
#65933 opened Jun 21, 2026 by jbrockmendel Member Loading…
DOC: Clarify Categorical vs Object memory usage #48438
#65932 opened Jun 21, 2026 by pranavchoudhary-tech Loading…
1 task done
1
BUG: read_csv pyarrow engine dtype handling with index_col/defaultdict Arrow pyarrow functionality Bug Dtype Conversions Unexpected or buggy dtype conversions IO CSV read_csv, to_csv
#65930 opened Jun 21, 2026 by jbrockmendel Member Loading…
3 tasks done
REF: use ._values for internal callers of lossy .values expressions pd.eval, query, pd.col IO JSON read_json, to_json, json_normalize Refactor Internal refactoring of code
#65929 opened Jun 21, 2026 by jbrockmendel Member Loading…
REF: route groupby plotting through dedicated _python_apply_plot Groupby Refactor Internal refactoring of code Visualization plotting
#65927 opened Jun 21, 2026 by jbrockmendel Member Loading…
3 tasks done
BUG: Series.sum on overflowing timedelta64 raises OutOfBoundsTimedelta (GH-43178) Bug Reduction Operations sum, mean, min, max, etc. Timedelta Timedelta data type
#65926 opened Jun 21, 2026 by jbrockmendel Member Loading…
2 tasks done
BUG: read_csv pyarrow engine ignored tuple names for MultiIndex columns Bug IO CSV read_csv, to_csv
#65925 opened Jun 21, 2026 by jbrockmendel Member Loading…
BUG: read_csv(engine="pyarrow") silently ignored na_filter=False Arrow pyarrow functionality Bug Error Reporting Incorrect or improved errors from pandas IO CSV read_csv, to_csv
#65924 opened Jun 21, 2026 by jbrockmendel Member Loading…
PERF: add lib.has_sentinel for integer-indexer sentinel scans Performance Memory or execution speed performance
#65923 opened Jun 21, 2026 by jbrockmendel Member Loading…
2 tasks done
PERF: vectorize is_range_indexer and is_sequence_range scans Performance Memory or execution speed performance
#65922 opened Jun 21, 2026 by jbrockmendel Member Loading…
2 tasks done
PERF: vectorize PeriodIndex.from_fields Performance Memory or execution speed performance Period Period data type
#65921 opened Jun 21, 2026 by jbrockmendel Member Loading…
3 tasks done
PERF: Frequency determination when concatting datetimes
#65920 opened Jun 21, 2026 by rhshadrach Member Loading…
1
CI: Update pixi.lock CI Continuous Integration
#65918 opened Jun 21, 2026 by github-actions Bot Loading…
Fix typo in OptionError messages
#65916 opened Jun 20, 2026 by dhruvatr Contributor Loading…
7 tasks
BUG: Preserve None when replacing NaN in string data
#65913 opened Jun 19, 2026 by goutamadwant Loading…
5 of 6 tasks
1
STY: Update min versions pre-commit hook to align pixi.toml Code Style Code style, linting, code_checks
#65912 opened Jun 19, 2026 by mroeschke Member Loading…
5 of 7 tasks
3.1
BUG: idxmin/idxmax with skipna=False returned wrong results (GH-56903) Bug Groupby Reduction Operations sum, mean, min, max, etc.
#65910 opened Jun 18, 2026 by jbrockmendel Member • Draft
4 tasks done
Backport PR #65840 on branch 3.0.x (PERF: Big slowdown of searchsorted on pd.Series) Performance Memory or execution speed performance Sorting e.g. sort_index, sort_values Strings String extension data type and string data
#65909 opened Jun 18, 2026 by meeseeksmachine Contributor Loading… 3.0.4
BUG: preserve dtype for NA columns with fill_value
#65907 opened Jun 18, 2026 by wasimat404 Loading…
1
5
BUG: Series.dt.isocalendar() not preserving index for pyarrow dtypes
#65902 opened Jun 18, 2026 by VishalGawade1 Loading…
7 tasks done
1
3
BUG: fix incorrect column name for index when to_sql callable method used with MultiIndex columns (GH#59112)
#65900 opened Jun 18, 2026 by adebayopeter Loading…
6 of 7 tasks
1
BUG: improve error message for non-string dtype with DB-API connection (GH#61385)
#65893 opened Jun 16, 2026 by adebayopeter Loading…
1
8
PERF: Speed up import pandas with PEP 810 lazy imports
#65885 opened Jun 15, 2026 by eendebakpt Loading…
3 of 4 tasks
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