GH-133789: Fix unpickling of pathlib objects pickled in Python 3.13 (#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+
This commit is contained in:
Barney Gale 2025-10-17 22:57:51 +01:00 committed by GitHub
parent 92025ea2c8
commit f4e51f253a
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3 changed files with 19 additions and 0 deletions

12
Lib/pathlib/_local.py Normal file
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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",
]

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@ -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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@ -0,0 +1 @@
Fix unpickling of :mod:`pathlib` objects that were pickled in Python 3.13.