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

def _parse_args(cls, args):
        # This is useful when you don't want to create an instance, just
        # canonicalize some constructor arguments.
        parts = []
        for a in args:
            if isinstance(a, PurePath):
                parts += a._parts
            else:
                if sys.version_info >= (3, 6):
                    a = os.fspath(a)
                else:
                    # duck typing for older Python versions
                    if hasattr(a, "__fspath__"):
                        a = a.__fspath__()
                if isinstance(a, str):
                    # Force-cast str subclasses to str (issue #21127)
                    parts.append(str(a))
                # also handle unicode for PY2 (six.text_type = unicode)
                elif six.PY2 and isinstance(a, six.text_type):
                    # cast to str using filesystem encoding
                    # note: in rare circumstances, on Python < 3.2,
                    # getfilesystemencoding can return None, in that

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)

if drv or root:
            if len(pat_parts) != len(parts):
                return False
            pat_parts = pat_parts[1:]
        elif len(pat_parts) > len(parts):
            return False
        for part, pat in zip(reversed(parts), reversed(pat_parts)):
            if not fnmatch.fnmatchcase(part, pat):
                return False
        return True


# Can't subclass os.PathLike from PurePath and keep the constructor
# optimizations in PurePath._parse_args().
if sys.version_info >= (3, 6):
    os.PathLike.register(PurePath)


class PurePosixPath(PurePath):
    _flavour = _posix_flavour
    __slots__ = ()


class PureWindowsPath(PurePath):
    """PurePath subclass for Windows systems.

    On a Windows system, instantiating a PurePath should return this object.
    However, you can also instantiate it directly on any system.
    """
    _flavour = _windows_flavour
    __slots__ = ()

class PureWindowsPath(PurePath):
    """PurePath subclass for Windows systems.

    On a Windows system, instantiating a PurePath should return this object.
    However, you can also instantiate it directly on any system.
    """
    _flavour = _windows_flavour
    __slots__ = ()


# Filesystem-accessing classes


class Path(PurePath):
    """PurePath subclass that can make system calls.

    Path represents a filesystem path but unlike PurePath, also offers
    methods to do system calls on path objects. Depending on your system,
    instantiating a Path will return either a PosixPath or a WindowsPath
    object. You can also instantiate a PosixPath or WindowsPath directly,
    but cannot instantiate a WindowsPath on a POSIX system or vice versa.
    """
    __slots__ = (
        '_accessor',
        '_closed',
    )

    def __new__(cls, *args, **kwargs):
        if cls is Path:
            cls = WindowsPath if os.name == 'nt' else PosixPath

pat_parts = pat_parts[1:]
        elif len(pat_parts) > len(parts):
            return False
        for part, pat in zip(reversed(parts), reversed(pat_parts)):
            if not fnmatch.fnmatchcase(part, pat):
                return False
        return True


# Can't subclass os.PathLike from PurePath and keep the constructor
# optimizations in PurePath._parse_args().
if sys.version_info >= (3, 6):
    os.PathLike.register(PurePath)


class PurePosixPath(PurePath):
    _flavour = _posix_flavour
    __slots__ = ()


class PureWindowsPath(PurePath):
    """PurePath subclass for Windows systems.

    On a Windows system, instantiating a PurePath should return this object.
    However, you can also instantiate it directly on any system.
    """
    _flavour = _windows_flavour
    __slots__ = ()


# Filesystem-accessing classes

return False
        return True


# Can't subclass os.PathLike from PurePath and keep the constructor
# optimizations in PurePath._parse_args().
if sys.version_info >= (3, 6):
    os.PathLike.register(PurePath)


class PurePosixPath(PurePath):
    _flavour = _posix_flavour
    __slots__ = ()


class PureWindowsPath(PurePath):
    """PurePath subclass for Windows systems.

    On a Windows system, instantiating a PurePath should return this object.
    However, you can also instantiate it directly on any system.
    """
    _flavour = _windows_flavour
    __slots__ = ()


# Filesystem-accessing classes


class Path(PurePath):
    """PurePath subclass that can make system calls.

    Path represents a filesystem path but unlike PurePath, also offers