在NLTK中,如何遍历已解析的句子以返回名词短语字符串列表?在
我有两个目标:
(1) 创建名词短语列表,而不是使用“traverse()”方法打印它们。我现在使用StringIO来记录现有traverse()方法的输出。这不是一个可接受的解决方案。
(2) 去解析名词短语字符串,使:“(NP Michael/NNP Jackson/NNP)”变为“Michael Jackson”。NLTK中是否有反解析的方法?在
NLTK文档建议使用traverse()来查看名词短语,但是如何在这个递归方法中捕获't'以便生成一个字符串名词短语列表?在
from nltk.tag import pos_tag
def traverse(t):
try:
t.label()
except AttributeError:
return
else:
if t.label() == 'NP': print(t) # or do something else
else:
for child in t:
traverse(child)
def nounPhrase(tagged_sent):
# Tag sentence for part of speech
tagged_sent = pos_tag(sentence.split()) # List of tuples with [(Word, PartOfSpeech)]
# Define several tag patterns
grammar = r"""
NP: {<DT|PP\$>?<JJ>*<NN>} # chunk determiner/possessive, adjectives and noun
{<NNP>+} # chunk sequences of proper nouns
{<NN>+} # chunk consecutive nouns
"""
cp = nltk.RegexpParser(grammar) # Define Parser
SentenceTree = cp.parse(tagged_sent)
NounPhrases = traverse(SentenceTree) # collect Noun Phrase
return(NounPhrases)
sentence = "Michael Jackson likes to eat at McDonalds"
tagged_sent = pos_tag(sentence.split())
NP = nounPhrase(tagged_sent)
print(NP)
目前打印:
(NP迈克尔/NNP杰克逊/NNP)
(NP麦当劳/NNP)
并将“None”存储到NP
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