Back to milestones

3.1

Open

No due date

•Last updated Oct 21, 2026

on-merge: backport to 3.1.x

99% complete

RLS: 3.1
pandas-dev/pandas#66674 · opened on Aug 9, 2026 · 3.1
5
BUG: read_excel with pyarrow backend does not infer correct data type with mixed values inside column
pandas-dev/pandas#63830 · opened on Jan 23, 2026 · 3.1
10
BUG: constructing string ArrowExtensionArray with NaNs fails
pandas-dev/pandas#64578 · opened on Mar 13, 2026 · 3.1
2
BUG: loc assignment of a length-1 NumPy array into a PyArrow column raises TypeError
pandas-dev/pandas#69443 · opened on Sep 24, 2026 · 3.1
4
BUG: object of type 'list_iterator' has no len()
pandas-dev/pandas#66514 · opened on Jul 28, 2026 · 3.1
5
BUG: str.contains/match/fullmatch/count with \s on pyarrow-backed strings miss \v and \x1c-\x1f
pandas-dev/pandas#70991 · opened on Oct 10, 2026 · 3.1
3
BUG: fix string regex operations with $ end indicator (always match Python behaviour)
Unread
#71387 opened Oct 20, 2026 · Updated Oct 21, 2026
1
DOC: cleanup 3.1.0 whatsnew
Unread
#71408 opened Oct 20, 2026 · Updated Oct 21, 2026Draft
BUG: parallel read_csv raising released memoryview on free-threaded Python (GH#71418)
Unread
#71442 opened Oct 21, 2026 · Updated Oct 21, 2026
Backport PR #71383 on branch 3.1.x (BUG: fix string regex operations with Python unicode escape sequence)
Unread
#71446 opened Oct 21, 2026 · Updated Oct 21, 2026
Backport PR #71429 on branch 3.1.x (DOC: add dedicated 3.1 whatsnew section for dependencies/build related changes)
Unread
#71447 opened Oct 21, 2026 · Updated Oct 21, 2026