Issues

• DOC: clarify and document ODS support in read_excel(), write_excel() and user guide

  DocsNeeds Triage
  pandas-dev/pandas#70151 · Filter by author stragu opened on Oct 2, 2026

• API/DEPR: what does infer_dtype of "mixed-integer" mean?

  API DesignDeprecateNeeds Discussion
  pandas-dev/pandas#70135 · Filter by author jbrockmendel opened on Oct 2, 2026

• BUG: pandas allows comparing complex numbers

  AlgosAPI DesignCompatComplexNeeds DiscussionNumeric Operations
  pandas-dev/pandas#70087 · Filter by author cmp0xff opened on Oct 1, 2026
  3

• DOC: Broken links in documentation

  Docs
  pandas-dev/pandas#70086 · Filter by author github-actions opened on Oct 1, 2026
  1

  

• BUG: website builder deletes source files when --target-path equals source_path

  BugNeeds Triage
  pandas-dev/pandas#70082 · Filter by author studentarijitpaul opened on Oct 1, 2026
  2

• BUG: DataFrame[tuple] returns a DataFrame instead of a Series for a unique full-depth key on a MultiIndex with duplicates

  Needs Triage
  pandas-dev/pandas#70005 · Filter by author Madin-H23 opened on Sep 30, 2026

• BUG: iloc assignment raises ValueError: The truth value of a Series is ambiguous with duplicated MultiIndex columns

  BugNeeds Triage
  pandas-dev/pandas#69959 · Filter by author ngxxx307 opened on Sep 30, 2026
  4

• BUG: groupby cumsum/cummin/cummax/rank give wrong results for datetime/timedelta columns when a group key is NaN

  BugGroupby
  pandas-dev/pandas#69923 · Filter by author oyiakoumis opened on Sep 29, 2026
  2

  

• API: warn when Timedelta/Datetime gets truncated?

  DatetimeNeeds DiscussionNon-NanoTimedelta
  pandas-dev/pandas#69920 · Filter by author jorisvandenbossche opened on Sep 29, 2026

• DOC: document unit-preserving behaviour in timedelta/datetime arithmetic

  DocsTimedelta
  pandas-dev/pandas#69919 · Filter by author jorisvandenbossche opened on Sep 29, 2026
  2

  

• API: Replace na_action with skipna in map methods

  API DesignApplyNeeds Discussion
  pandas-dev/pandas#69578 · Filter by author rhshadrach opened on Sep 27, 2026
  1

• PERF: df.loc[row, cols] returns a small Series that keeps a (len(cols), len(df)) temporary array alive (regression from 2.x)

  Copy / view semanticsPerformance
  pandas-dev/pandas#69477 · Filter by author rahfar opened on Sep 25, 2026
  3

• BUG: .str and .dt accessors raise on dictionary-encoded ArrowDtype

  pandas-dev/pandas#69462 · Filter by author Sanjays2402 opened on Sep 25, 2026
  1

  

• BUG: to_json(date_format="iso") segfaults on a failed allocation — NpyDateTimeToIsoCallback returns NULL without setting errorMsg

  pandas-dev/pandas#69461 · Filter by author Koalk opened on Sep 25, 2026
  1

  

• BUG: loc assignment of a length-1 NumPy array into a PyArrow column raises TypeError

  Bug
  pandas-dev/pandas#69443 · Filter by author hebian1994 opened on Sep 24, 2026 · 3.1
  2

• BUG: Series arithmetic ops with PyArrow dtypes and scalars can upcast

  ArrowBugDtype ConversionsNumeric Operations
  pandas-dev/pandas#69436 · Filter by author rhshadrach opened on Sep 23, 2026
  9

  

• API: should the _supports_2d contract require repeat(axis=...)?

  ExtensionArray - New Method RequestNeeds Discussion
  pandas-dev/pandas#69153 · Filter by author jbrockmendel opened on Sep 20, 2026

• BUG: Value-dependent formatting when casting from datetime to string

  AstypeBugDatetimeDtype ConversionsNeeds Discussion
  pandas-dev/pandas#69011 · Filter by author cbourjau opened on Sep 18, 2026
  4

• BUG/DEPR: low_memory keyword in read_csv

  API DesignDeprecateIO CSVNeeds Discussion
  pandas-dev/pandas#68706 · Filter by author jbrockmendel opened on Sep 14, 2026
  3

• DEPR: cache_dates in read_csv

  DeprecateIO CSV
  pandas-dev/pandas#68705 · Filter by author jbrockmendel opened on Sep 14, 2026
  8

  

• API: select_dtypes

  API DesignNeeds Discussion
  pandas-dev/pandas#68703 · Filter by author jbrockmendel opened on Sep 14, 2026 · 3.2
  8

• BUG: parallel read_csv with sqlite converters

  BugIO CSV
  pandas-dev/pandas#68505 · Filter by author jbrockmendel opened on Sep 12, 2026 · 3.1
  5

  

• ERR: assert_numpy_array_equal gives confusing assertion message for NaT with different unit

  Error ReportingTesting
  pandas-dev/pandas#68459 · Filter by author jorisvandenbossche opened on Sep 11, 2026
  2

  

• DOC/RLS: improve the 3.1.0 whatsnew notes

  Blocker for rcDocsNeeds Discussion
  pandas-dev/pandas#68437 · Filter by author jorisvandenbossche opened on Sep 11, 2026 · 3.1
  8

• ENH: move the postgresql extra from psycopg2 to psycopg 3

  EnhancementNeeds Discussion
  pandas-dev/pandas#68433 · Filter by author juanmicl opened on Sep 11, 2026
  2