from nltk.corpus import wordnet
syn=wordnet.synsets('cookbook')[0]
print syn.definition
预期输出：
'a book of recipes and cooking directions'
实际输出：
bound method Synset.definition of Synset('cookbook.n.01')
我无法查明代码中导致实际输出与预期输出之间存在差异的错误。
>>> from nltk.corpus import wordnet as wn
>>> wn.synsets('dog')[0]
Synset('dog.n.01')
>>> wn.synsets('dog')[0].definition
<bound method Synset.definition of Synset('dog.n.01')>
>>> wn.synsets('dog')[0].definition()
u'a member of the genus Canis (probably descended from the common wolf) that has been domesticated by man since prehistoric times; occurs in many breeds'
这是因为Synset对象属性已更改为Synset函数，参见https://github.com/nltk/nltk/commit/ba8ab7e23ea2b8d61029484098fd62d5986acd9c
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