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Pull requests: pandas-dev/pandas
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PERF: don't call unique on dtypes for checking if string dtype is present (select_dtypes)
Performance
Memory or execution speed performance
Backport PR #64379 on branch 3.0.x (PERF: improve performance with ZoneInfo timezones (get internal transitions/deltas to avoid slow python path))
Performance
Memory or execution speed performance
Timezones
Timezone data dtype
Cache BlockManager.get_dtypes result for repeated calls
#65479
opened May 6, 2026 by
ssam18
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BUG: fix Index.get_indexer pd.NA vs NaN inconsistency (GH#65419)
#65477
opened May 5, 2026 by
mitre88
Contributor
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TST/CLN: salvage or remove FIXME-commented-out tests
#65476
opened May 5, 2026 by
jbrockmendel
Member
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4 tasks done
TST: replace 5GB commented-out test_string_column_above_2GB (GH-55606)
#65475
opened May 5, 2026 by
jbrockmendel
Member
•
Draft
2 tasks
BUG: DateOffset arithmetic not supported for date32[pyarrow] (GH#57168)
#65473
opened May 5, 2026 by
berasaikat
Contributor
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BLD: Add xsimd Dependency and SIMD detection
#65471
opened May 5, 2026 by
Alvaro-Kothe
Member
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1 task
REF: Guard ujson refactors against string buffer copy during heap promotion
#65468
opened May 5, 2026 by
orbisai0security
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DOC: Clarify aliasing and alignment fallback in .iloc assignment
#65467
opened May 5, 2026 by
guci-toma
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3 of 7 tasks
BUG: Ensure consistent index naming when merging with empty DataFrames
#65457
opened May 4, 2026 by
mapanahi
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7 tasks done
Pr 65368: update pyarrow nightly lock to 25.0.0.dev28 to resolve pyarrow nightly error
#65456
opened May 4, 2026 by
Manjugadupudi
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7 tasks done
DOC: Fix iloc assignment example to avoid label alignment confusion
#65448
opened May 3, 2026 by
Manav-Vaddoriya
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PERF: speed up read_sas for compressed SAS7BDAT files
Performance
Memory or execution speed performance
#65444
opened May 2, 2026 by
jbrockmendel
Member
•
Draft
4 of 5 tasks
BUG: Index.str.split/rsplit/findall return ndarray on object path
#65443
opened May 1, 2026 by
jbrockmendel
Member
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7 tasks done
BUG: Index.get_indexer matches pd.NA against NaN for list input but not ndarray input #65419
#65442
opened May 1, 2026 by
sayantancodex
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3 tasks done
TST: regression test for concat with keys and mixed-freq PeriodIndex columns
#65439
opened May 1, 2026 by
jbrockmendel
Member
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1 task done
DEPR: %n directive in Period.strftime, use %N instead
Deprecate
Functionality to remove in pandas
#65432
opened Apr 30, 2026 by
jbrockmendel
Member
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4 tasks done
BUG: restore array-level state and avoid object roundtrip in DataFrame._append_internal
#65431
opened Apr 30, 2026 by
jbrockmendel
Member
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4 tasks done
BUG: fix offset uppercase aliases rejection path and error types
#65428
opened Apr 30, 2026 by
sun-0-set
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7 tasks done
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