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GH-103631: Fix PurePosixPath(PureWindowsPath(...)) separator handling (GH-104949)

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For backwards compatibility, accept backslashes as path separators in
`PurePosixPath` if an instance of `PureWindowsPath` is supplied.
This restores behaviour from Python 3.11.

Co-authored-by: Gregory P. Smith <greg@krypto.org>
This commit is contained in:
Barney Gale 2023-05-26 19:05:43 +01:00 • committed by GitHub
parent ad0be361c9
commit 328422ce61
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3 changed files with 11 additions and 0 deletions
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3
Lib/pathlib.py
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@ -300,6 +300,9 @@ class PurePath(os.PathLike):
for arg in args: for arg in args:
if isinstance(arg, PurePath): if isinstance(arg, PurePath):
path = arg._raw_path path = arg._raw_path
if arg._flavour is ntpath and self._flavour is posixpath:
# GH-103631: Convert separators for backwards compatibility.
path = path.replace('\\', '/')
else: else:
try: try:
path = os.fspath(arg) path = os.fspath(arg)

6
Lib/test/test_pathlib.py
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@ -789,6 +789,12 @@ class PurePosixPathTest(_BasePurePathTest, unittest.TestCase):
pp = P('//a') / '/c' pp = P('//a') / '/c'
self.assertEqual(pp, P('/c')) self.assertEqual(pp, P('/c'))
def test_parse_windows_path(self):
P = self.cls
p = P('c:', 'a', 'b')
pp = P(pathlib.PureWindowsPath('c:\\a\\b'))
self.assertEqual(p, pp)
class PureWindowsPathTest(_BasePurePathTest, unittest.TestCase): class PureWindowsPathTest(_BasePurePathTest, unittest.TestCase):
cls = pathlib.PureWindowsPath cls = pathlib.PureWindowsPath

2
Misc/NEWS.d/next/Library/2023-05-25-23-34-54.gh-issue-103631.x5Urye.rst Normal file
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@ -0,0 +1,2 @@
Fix ``pathlib.PurePosixPath(pathlib.PureWindowsPath(...))`` not converting
path separators to restore 3.11 compatible behavior.