python · barneygale · May 26, 2023 · May 25, 2023 · May 26, 2023
@@ -300,6 +300,9 @@ def __init__(self, *args):
        for arg in args:
            if isinstance(arg, PurePath):
                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:
                try:
                    path = os.fspath(arg)

@@ -789,6 +789,12 @@ def test_div(self):
        pp = P('//a') / '/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):
    cls = pathlib.PureWindowsPath

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