def _initialize_builtins():
 for filename in os.listdir(_handler_dir):
  if os.path.isfile(_get_yaml_path(filename, '')):
   _available_builtins.append(filename)

def _initialize_builtins ( ) : for filename in os . listdir ( _handler_dir ) : if os . path . isfile ( _get_yaml_path ( filename , '' ) ) : _available_builtins . append ( filename )
scan the immediate subdirectories of the builtins module .