[3.12] pythongh-124917: Allow keyword args to os.path.exists/lexists on Windows (pythonGH-124918)

(cherry picked from commit cc2938a)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: JelleZijlstra

Lib/test/test_genericpath.py

@@ -158,6 +158,10 @@ def test_exists(self):
             self.assertIs(self.pathmodule.lexists(filename + '\x00'), False)
             self.assertIs(self.pathmodule.lexists(bfilename + b'\x00'), False)
 
+        # Keyword arguments are accepted
+        self.assertIs(self.pathmodule.exists(path=filename), True)
+        self.assertIs(self.pathmodule.lexists(path=filename), True)
+
     @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     @unittest.skipIf(is_emscripten, "Emscripten pipe fds have no stat")
     def test_exists_fd(self):

Misc/NEWS.d/next/Library/2024-10-02-21-11-18.gh-issue-124917.Lnwh5b.rst

@@ -0,0 +1,2 @@
+Allow calling :func:`os.path.exists` and :func:`os.path.lexists` with
+keyword arguments on Windows. Fixes a regression in 3.13.0.

Modules/clinic/posixmodule.c.h

@@ -5209,15 +5209,14 @@ _testFileType(path_t *path, int testedType)
 os._path_exists -> bool
 
     path: path_t(allow_fd=True, suppress_value_error=True)
-    /
 
 Test whether a path exists.  Returns False for broken symbolic links.
 
 [clinic start generated code]*/
 
 static int
 os__path_exists_impl(PyObject *module, path_t *path)
-/*[clinic end generated code: output=8da13acf666e16ba input=29198507a6082a57]*/
+/*[clinic end generated code: output=8da13acf666e16ba input=142beabfc66783eb]*/
 {
     return _testFileExists(path, TRUE);
 }