code: def list_files(self, node=None):
          
  
          return [file_node.path for file_node in self.list_file_nodes(node) if file_node.path]
docs: Returns the Model files.
  
          :param node: Node to start walking from.
          :type node: AbstractNode or AbstractCompositeNode or Object
          :return: FileNode nodes.
          :rtype: list