How to use the pathlib2.__init__.PureWindowsPath function in pathlib2

and self._parts and self._parts[0][:1] == '~'):
            homedir = self._flavour.gethomedir(self._parts[0][1:])
            return self._from_parts([homedir] + self._parts[1:])

        return self


class PosixPath(Path, PurePosixPath):
    """Path subclass for non-Windows systems.

    On a POSIX system, instantiating a Path should return this object.
    """
    __slots__ = ()


class WindowsPath(Path, PureWindowsPath):
    """Path subclass for Windows systems.

    On a Windows system, instantiating a Path should return this object.
    """
    __slots__ = ()

    def owner(self):
        raise NotImplementedError("Path.owner() is unsupported on this system")

    def group(self):
        raise NotImplementedError("Path.group() is unsupported on this system")

    def is_mount(self):
        raise NotImplementedError(
            "Path.is_mount() is unsupported on this system")

def __new__(cls, *args):
        """Construct a PurePath from one or several strings and or existing
        PurePath objects.  The strings and path objects are combined so as
        to yield a canonicalized path, which is incorporated into the
        new PurePath object.
        """
        if cls is PurePath:
            cls = PureWindowsPath if os.name == 'nt' else PurePosixPath
        return cls._from_parts(args)