Barney Gale e4ff131e01 GH-44626, GH-105476: Fix ntpath.isabs() handling of part-absolute paths (#113829) ...

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>

2024-01-13 07:36:05 +00:00

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