Issues

• PERF: DataFrame.to_csv with date_format remains slow for a DatetimeIndex

  Needs TriagePerformance
  pandas-dev/pandas#71843 · Filter by author idan-friedman opened on Nov 2, 2026
  2

• CI: pandas-stubs tests fail against pandas nightly

  CITyping
  pandas-dev/pandas#71839 · Filter by author github-actions opened on Nov 2, 2026

• BUG: Can't set a pint quantity scalar as index

  BugNeeds Triage
  pandas-dev/pandas#71835 · Filter by author andrewgsavage opened on Nov 1, 2026
  1

• ENH: DataFrame.merge raises bare KeyError without saying which DataFrame is missing the key column

  EnhancementNeeds Triage
  pandas-dev/pandas#71819 · Filter by author murainah opened on Nov 1, 2026
  1

• PERF: pd.eval() copies the whole result in reconstruct_object

  Needs TriagePerformance
  pandas-dev/pandas#71806 · Filter by author luohuayouyi12138 opened on Oct 31, 2026
  1

• ENH: ListAccessor.contains

  EnhancementNeeds Triage
  pandas-dev/pandas#71775 · Filter by author aulemahal opened on Oct 29, 2026
  2

• DEPR: scatter_matrix, radviz, andrews_curves, bootstrap_plot, parallel_coordinates, lag_plot, autocorrelation_plot

  DeprecateNeeds DiscussionVisualization
  pandas-dev/pandas#71771 · Filter by author mroeschke opened on Oct 29, 2026
  1

• BUG: read_csv fails with TypeError: open() argument 'mode' must be str, not int (with LocalPath)

  IO CSVRegression
  pandas-dev/pandas#71769 · Filter by author behrenhoff opened on Oct 29, 2026 · 3.1.1
  3

  

• BUG: Series.rank() on object dtype returns random output when a comparison raises an error

  BugNeeds Triage
  pandas-dev/pandas#71768 · Filter by author theosotr opened on Oct 29, 2026
  2

• DOC: ExtensionDtype.empty is not in the API reference

  DocsNeeds Triage
  pandas-dev/pandas#71766 · Filter by author mmporong opened on Oct 29, 2026
  4

• BUG: json_normalize max_level raises KeyError for nested integer mapping keys

  Needs Triage
  pandas-dev/pandas#71755 · Filter by author dongyikuan919 opened on Oct 28, 2026
  4

• DOC: Add MultiIndex.to_list() to docs and indicate that it returns a list of tuples

  Docs
  pandas-dev/pandas#71742 · Filter by author Dr-Irv opened on Oct 27, 2026
  7

  

• BUG: DataFrame.to_string(max_cols=0) exceeds terminal width with uneven columns

  BugNeeds Triage
  pandas-dev/pandas#71603 · Filter by author mncrftfrcnm opened on Oct 25, 2026
  3

• BUG: pd.Series.map on dtype: datetime64[us] makes underlying data values array read-only - .transform does not

  ApplyCopy / view semanticsRegression
  pandas-dev/pandas#71567 · Filter by author echedey-ls opened on Oct 25, 2026 · 3.1.1
  2

  

• BUG: pandas 3.1.0 fails to build on s390x — 'load_unaligned' is not a member of 'xsimd' in the scalar fallback TU

  BugBuild
  pandas-dev/pandas#71548 · Filter by author HarikrishnanBalagopal opened on Oct 25, 2026 · 3.1.1
  2

  

• BUG: ffill/bfill on a pyarrow-backed column without missing values returns a view, so modifying the result changes the original

  BugCopy / view semantics
  pandas-dev/pandas#71515 · Filter by author maharanay22 opened on Oct 24, 2026 · 3.1.1
  5

  

• BUG: assert_frame_equal failure message hides float differences below display.precision

  BugOutput-FormattingTesting
  pandas-dev/pandas#71509 · Filter by author cjw296 opened on Oct 24, 2026 · 3.1.1
  4

  

• BUG: DataFrame.shift() with multiple periods returns incorrect columns for empty DataFrames

  BugNeeds Triage
  pandas-dev/pandas#71507 · Filter by author sauravsingla opened on Oct 24, 2026
  2

• BUG: AttributeError: 'NoneType' object has no attribute 'total_seconds' using win32timezone.TimeZoneInfo

  BugNeeds Triage
  pandas-dev/pandas#71485 · Filter by author Djfe opened on Oct 23, 2026
  3

• BUG: Series.str.repeat with a negative count raises ArrowInvalid for pyarrow-backed string dtype

  ArrowBugStrings
  pandas-dev/pandas#71482 · Filter by author Huang-404-Q opened on Oct 23, 2026
  

• BUG: Logical OR does not obey Kleene three-valued logic

  BugNA - MaskedArraysNumeric Operations
  pandas-dev/pandas#71478 · Filter by author warwickmm opened on Oct 22, 2026
  8

  

• RLS: 3.1.x releases

  Release
  pandas-dev/pandas#71477 · Filter by author jorisvandenbossche opened on Oct 22, 2026 · 3.1.1

• BUG: mean of column with numpy arrays stopped working in 3.1.0

  BugNeeds Triage
  pandas-dev/pandas#71476 · Filter by author wgifford opened on Oct 22, 2026 · 3.1.1
  3

• any() and all() methods return inconsistent types based on underlying storage - should they always return python bool ?

  Needs Discussionpython_scalars
  pandas-dev/pandas#71475 · Filter by author Dr-Irv opened on Oct 22, 2026
  4

• BUG: dateutil timezones raise AttributeError with python-dateutil 3.0

  BugCompatNeeds DiscussionTimezones
  pandas-dev/pandas#71459 · Filter by author Cha-Imaa opened on Oct 22, 2026 · 3.1.1
  9