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Fix pivot_table duplicate indices with Python 3.14 + NumPy 1.26 #63324

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Fix pivot_table duplicate indices with Python 3.14 + NumPy 1.26 #63324

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5e92681
fix pivot_table duplicates on py3.14 with old numpy
AKHIL-149 Dec 11, 2025
246ffec
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Dec 11, 2025
af06a77
use pandas compat constants for version checks
AKHIL-149 Dec 12, 2025
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12 changes: 11 additions & 1 deletion pandas/core/reshape/reshape.py
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Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,17 @@ def _make_selectors(self) -> None:
self.group_index = comp_index
self.mask = mask
if self.sort:
self.compressor = comp_index.searchsorted(np.arange(ngroups))
import sys

# GH 63314: avoid searchsorted bug with py3.14 + numpy < 2.0
numpy_major = int(np.__version__.split(".")[0])
has_searchsorted_bug = sys.version_info >= (3, 14) and numpy_major < 2
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@jorisvandenbossche jorisvandenbossche Dec 12, 2025

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There are some existing constants you can use for this:

from pandas.compat.numpy import np_version_gt2
from pandas.compat import PY314


if has_searchsorted_bug:
# use manual approach instead of buggy searchsorted
self.compressor = np.sort(np.unique(comp_index, return_index=True)[1])
else:
self.compressor = comp_index.searchsorted(np.arange(ngroups))
else:
self.compressor = np.sort(np.unique(comp_index, return_index=True)[1])

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