def FRAME_ATTR_NAMES_SET():
 out = set()
 for frame_cls in frame_transform_graph.frame_set:
  for attr in frame_cls.get_frame_attr_names().keys():
   out.add(attr)
 return out

def FRAME_ATTR_NAMES_SET ( ) : out = set ( ) for frame_cls in frame_transform_graph . frame_set : for attr in frame_cls . get_frame_attr_names ( ) . keys ( ) : out . add ( attr ) return out
set of all possible frame-specific attributes .