使用库没有简单的方法来做到这一点(yaml dumper 语法树中的节点对象是被动的，无法发出此信息)，所以我结束了与

There's no easy way to do this with the library (Node objects in yaml dumper syntax tree are passive and can't emit this info), so I ended up with

stream = yaml.dump(list_of_dicts, default_flow_style = False)
file.write(stream.replace('\n- ', '\n\n- '))