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[3.14] GH-133789: Fix unpickling of pathlib objects pickled in Python 3.13 (GH-133831) #140276

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Merged
barneygale merged 1 commit into from
Oct 17, 2025
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[3.14] GH-133789: Fix unpickling of pathlib objects pickled in Python 3.13 (GH-133831) #140276

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GH-133789: Fix unpickling of pathlib objects pickled in Python 3.13 (G… 
…H-133831)

In Python 3.13 (but not 3.12 or 3.14), pathlib classes are defined in
`pathlib._local` rather than `pathlib`. In hindsight this was a mistake,
but it was difficult to predict how the abstract/local split would pan out.

In this patch we re-introduce `pathlib._local` as a stub module that
re-exports the classes from `pathlib`. This allows path objects pickled in
3.13 to be unpicked in 3.14+
(cherry picked from commit f4e51f2)

Co-authored-by: Barney Gale <barney.gale@gmail.com>
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@barneygale @miss-islington
barneygale authored and miss-islington committed Oct 17, 2025
commit 03f4759d7f82dfe032b3af3e11561ae7dc3bc59e
12 changes: 12 additions & 0 deletions Lib/pathlib/_local.py
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@@ -0,0 +1,12 @@
"""
This module exists so that pathlib objects pickled under Python 3.13 can be
unpickled in 3.14+.
"""

from pathlib import *

__all__ = [
"UnsupportedOperation",
"PurePath", "PurePosixPath", "PureWindowsPath",
"Path", "PosixPath", "WindowsPath",
]
6 changes: 6 additions & 0 deletions Lib/test/test_pathlib/test_pathlib.py
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Expand Up @@ -293,6 +293,12 @@ def test_pickling_common(self):
self.assertEqual(hash(pp), hash(p))
self.assertEqual(str(pp), str(p))

def test_unpicking_3_13(self):
data = (b"\x80\x04\x95'\x00\x00\x00\x00\x00\x00\x00\x8c\x0e"
b"pathlib._local\x94\x8c\rPurePosixPath\x94\x93\x94)R\x94.")
p = pickle.loads(data)
self.assertIsInstance(p, pathlib.PurePosixPath)

def test_repr_common(self):
for pathstr in ('a', 'a/b', 'a/b/c', '/', '/a/b', '/a/b/c'):
with self.subTest(pathstr=pathstr):
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2025-05-10-15-10-54.gh-issue-133789.I-ZlUX.rst
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Fix unpickling of :mod:`pathlib` objects that were pickled in Python 3.13.
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