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Pull requests: pandas-dev/pandas
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BUG: Fix length_of_indexer for negative-step slices (GH#66100)
#66108
opened Jul 1, 2026 by
uttam12331
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2 tasks done
DOC: Add whatsnew note for %N strptime parsing
#66107
opened Jun 30, 2026 by
pranavchoudhary-tech
Contributor
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BUG: DataFrame.loc partial assignment upcasting dtype of untouched columns
#66106
opened Jun 30, 2026 by
gautamvarmadatla
Contributor
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6 of 7 tasks
BUG: pivot_table margins drop valid rows when dropna=True and aggfunc is dict (GH#65765)
#66103
opened Jun 30, 2026 by
anzinmhd
Contributor
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3 tasks done
BUG: fix length_of_indexer returning negative length for negative-ste…
#66101
opened Jun 30, 2026 by
tanistheta
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4 of 7 tasks
BUG: select_dtypes ExtensionDtype instance and bracketed-string matching (GH#59888)
#66099
opened Jun 30, 2026 by
jbrockmendel
Member
•
Draft
4 tasks done
BUG: select_dtypes ExtensionDtype matching (GH#40234, GH#59888)
Bug
NA - MaskedArrays
Related to pd.NA and nullable extension arrays
#66096
opened Jun 30, 2026 by
jbrockmendel
Member
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BLD: build wheels against the oldest supported numpy (py3.14 segfault)
#66090
opened Jun 29, 2026 by
jbrockmendel
Member
•
Draft
TST: tighten loose exception-message checks in tests
#66082
opened Jun 28, 2026 by
jbrockmendel
Member
•
Draft
BUG: read_csv(engine="pyarrow") parse_dates does not parse numeric-looking dates
Arrow
pyarrow functionality
Bug
Datetime
Datetime data dtype
IO CSV
read_csv, to_csv
#66066
opened Jun 27, 2026 by
jbrockmendel
Member
•
Draft
TST: handle pyarrow-engine read_csv upstream-limitation xfails
Arrow
pyarrow functionality
IO CSV
read_csv, to_csv
Testing
pandas testing functions or related to the test suite
#66065
opened Jun 27, 2026 by
jbrockmendel
Member
•
Draft
TST: assert pyarrow-engine read_csv behavior for by-design divergences
Arrow
pyarrow functionality
IO CSV
read_csv, to_csv
Testing
pandas testing functions or related to the test suite
#66064
opened Jun 27, 2026 by
jbrockmendel
Member
•
Draft
BUG: read_csv(engine="pyarrow") with a scalar dtype and index_col
Arrow
pyarrow functionality
Bug
Dtype Conversions
Unexpected or buggy dtype conversions
IO CSV
read_csv, to_csv
#66063
opened Jun 27, 2026 by
jbrockmendel
Member
•
Draft
BUG: read_csv(engine="pyarrow") tuple names do not produce MultiIndex columns
Arrow
pyarrow functionality
Bug
IO CSV
read_csv, to_csv
#66062
opened Jun 27, 2026 by
jbrockmendel
Member
•
Draft
BUG: read_csv(engine="pyarrow") ignores names passed with an integer header
Arrow
pyarrow functionality
Bug
IO CSV
read_csv, to_csv
#66058
opened Jun 27, 2026 by
jbrockmendel
Member
•
Draft
BUG: read_csv(engine="pyarrow") column-name dedup and unnamed-header handling
Arrow
pyarrow functionality
Bug
IO CSV
read_csv, to_csv
#66057
opened Jun 27, 2026 by
jbrockmendel
Member
•
Draft
BUG: Fix plotting with tz-aware normalized DatetimeIndex dropping tz info
#66047
opened Jun 27, 2026 by
C1-BA-B1-F3
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PERF: groupby _factorize_monotonic with freq attribute
Groupby
Performance
Memory or execution speed performance
BUG:#22183 : Fixed Groupby Legend Labels for scatter plot
#66027
opened Jun 25, 2026 by
Saihritesh
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BUG: Fix Series.combine_first silently ignoring duplicate indices (#66009)
#66025
opened Jun 25, 2026 by
krishgarg344
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TST: add regression test for combine_first with duplicate index (GH#66009)
#66013
opened Jun 24, 2026 by
AdvenRanises
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PERF: serialize tz-aware datetime to_json from datetime64 ndarray
Bug
IO JSON
read_json, to_json, json_normalize
Performance
Memory or execution speed performance
Timezones
Timezone data dtype
#66007
opened Jun 24, 2026 by
jbrockmendel
Member
•
Draft
BUG: DataFrame constructor aliases index and columns when passed the same Index (GH#42934)
Bug
Constructors
Series/DataFrame/Index/pd.array Constructors
Copy / view semantics
Index
Related to the Index class or subclasses
#66000
opened Jun 23, 2026 by
jbrockmendel
Member
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BUG: prevent silent corruption of Index via .values/.array (GH#38547)
Bug
Copy / view semantics
Index
Related to the Index class or subclasses
#65994
opened Jun 23, 2026 by
jbrockmendel
Member
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BUG: Fix merge with NaN-labeled join key producing duplicate columns
#65982
opened Jun 22, 2026 by
wahajahmed010
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6 of 8 tasks
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