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GH-44626, GH-105476: Fix ntpath.isabs() handling of part-absolute paths (#113829)

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On Windows, `os.path.isabs()` now returns `False` when given a path that
starts with exactly one (back)slash. This is more compatible with other
functions in `os.path`, and with Microsoft's own documentation.

Also adjust `pathlib.PureWindowsPath.is_absolute()` to call
`ntpath.isabs()`, which corrects its handling of partial UNC/device paths
like `//foo`.

Co-authored-by: Jon Foster <jon@jon-foster.co.uk>
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Barney Gale 2024-01-13 07:36:05 +00:00 • committed by GitHub
parent dac1da2121
commit e4ff131e01
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9 changed files with 51 additions and 33 deletions
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4
Lib/test/test_unittest/test_program.py
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@ -459,8 +459,8 @@ class TestCommandLineArgs(unittest.TestCase):
def testParseArgsAbsolutePathsThatCannotBeConverted(self):
program = self.program
# even on Windows '/...' is considered absolute by os.path.abspath
argv = ['progname', '/foo/bar/baz.py', '/green/red.py']
drive = os.path.splitdrive(os.getcwd())[0]
argv = ['progname', f'{drive}/foo/bar/baz.py', f'{drive}/green/red.py']
self._patch_isfile(argv)
program.createTests = lambda: None