如何在Python中使用WordNet？

Question

代码

wn.synset('accident.n.01').topic_domains()

错误

Traceback (most recent call last):
  File "<pyshell#46>", line 1, in <module>
    wn.synset('accident.n.01').topic_domains()
AttributeError: 'Synset' object has no attribute 'topic_domains'