How to use the scons.scons-local-250.SCons.Node.FS.Dir function in SCons

If a Node for the specified "p" doesn't already exist, and
        "create" is specified, the Node may be created after recursive
        invocation to find or create the parent directory or directories.
        """
        k = _my_normcase(p)
        try:
            result = self._lookupDict[k]
        except KeyError:
            if not create:
                msg = "No such file or directory: '%s' in '%s' (and create is False)" % (p, str(self))
                raise SCons.Errors.UserError(msg)
            # There is no Node for this path name, and we're allowed
            # to create it.
            dir_name, file_name = p.rsplit('/',1)
            dir_node = self._lookup_abs(dir_name, Dir)
            result = klass(file_name, dir_node, self.fs)

            # Double-check on disk (as configured) that the Node we
            # created matches whatever is out there in the real world.
            result.diskcheck_match()

            self._lookupDict[k] = result
            dir_node.entries[_my_normcase(file_name)] = result
            dir_node.implicit = None
        else:
            # There is already a Node for this path name.  Allow it to
            # complain if we were looking for an inappropriate type.
            result.must_be_same(klass)
        return result

If a Node for the specified "p" doesn't already exist, and
        "create" is specified, the Node may be created after recursive
        invocation to find or create the parent directory or directories.
        """
        k = _my_normcase(p)
        try:
            result = self._lookupDict[k]
        except KeyError:
            if not create:
                msg = "No such file or directory: '%s' in '%s' (and create is False)" % (p, str(self))
                raise SCons.Errors.UserError(msg)
            # There is no Node for this path name, and we're allowed
            # to create it.
            dir_name, file_name = p.rsplit('/',1)
            dir_node = self._lookup_abs(dir_name, Dir)
            result = klass(file_name, dir_node, self.fs)

            # Double-check on disk (as configured) that the Node we
            # created matches whatever is out there in the real world.
            result.diskcheck_match()

            self._lookupDict[k] = result
            dir_node.entries[_my_normcase(file_name)] = result
            dir_node.implicit = None
        else:
            # There is already a Node for this path name.  Allow it to
            # complain if we were looking for an inappropriate type.
            result.must_be_same(klass)
        return result

fd = self.default_filedir
        dir, name = os.path.split(fd)
        drive, d = _my_splitdrive(dir)
        if not name and d[:1] in ('/', OS_SEP):
            #return p.fs.get_root(drive).dir_on_disk(name)
            return p.fs.get_root(drive)
        if dir:
            p = self.filedir_lookup(p, dir)
            if not p:
                return None
        norm_name = _my_normcase(name)
        try:
            node = p.entries[norm_name]
        except KeyError:
            return p.dir_on_disk(name)
        if isinstance(node, Dir):
            return node
        if isinstance(node, Entry):
            node.must_be_same(Dir)
            return node
        return None

n = selfEntry(name)
                        if n.__class__ != node.__class__:
                            n.__class__ = node.__class__
                            n._morph()

        names = set(names)
        if pattern[0] != '.':
            names = [x for x in names if x[0] != '.']
        names = fnmatch.filter(names, pattern)

        if strings:
            return names

        return [self.entries[_my_normcase(n)] for n in names]

class RootDir(Dir):
    """A class for the root directory of a file system.

    This is the same as a Dir class, except that the path separator
    ('/' or '\\') is actually part of the name, so we don't need to
    add a separator when creating the path names of entries within
    this directory.
    """
    
    __slots__ = ['_lookupDict']
    
    def __init__(self, drive, fs):
        if SCons.Debug.track_instances: logInstanceCreation(self, 'Node.FS.RootDir')
        SCons.Node.Node.__init__(self)

        # Handle all the types of drives:
        if drive == '':

def Dir(self, name, directory = None, create = True):
        """Look up or create a Dir node with the specified name.  If
        the name is a relative path (begins with ./, ../, or a file name),
        then it is looked up relative to the supplied directory node,
        or to the top level directory of the FS (supplied at construction
        time) if no directory is supplied.

        This method will raise TypeError if a normal file is found at the
        specified path.
        """
        return self._lookup(name, directory, Dir, create)

# UNC '//' prefix.
            if p != '/':
                p = p.rstrip('/')

            needs_normpath = needs_normpath_match(p)

            if p[0:1] == '/':
                # Absolute path
                root = self.get_root(drive)
            else:
                # This is a relative lookup or to the current directory
                # (the path name is not absolute).  Add the string to the
                # appropriate directory lookup path, after which the whole
                # thing gets normalized.
                if directory:
                    if not isinstance(directory, Dir):
                        directory = self.Dir(directory)
                else:
                    directory = self._cwd

                if p in ('', '.'):
                    p = directory.get_labspath()
                else:
                    p = directory.get_labspath() + '/' + p

                if drive:
                    root = self.get_root(drive)
                else:
                    root = directory.root

        if needs_normpath is not None:
            # Normalize a pathname. Will return the same result for