概述
我正在尝试使用pyparsing解析一些交通违规句子,当我使用grammar.searchString(句子)时它没关系,但是当我使用parseString时抛出ParseException.任何人都可以帮我,请说我的代码出了什么问题？
from pyparsing import Or,Literal,oneOf,OneOrMore,nums,alphas,Regex,Word,\
SkipTo,LineEnd,originalTextFor,Optional,ZeroOrMore,Keyword,Group
import pyparsing as pp
from nltk.tag import pos_tag
sentences = ['Failure to control vehicle speed on highway to avoid collision','Failure to stop at stop sign','Introducing additives into special fuel by unauthorized person and contrary to regulations','driver fail to stop at yield sign at nearest pointf approaching traffic view when req. for safety','Operating unregistered motor vehicle on highway','Exceeding maximum speed: 39 MPH in a posted 30 MPH zone']
for sentence in sentences:
words = pos_tag(sentence.split())
#print words
verbs = [word for word,pos in words if pos in ['VB','VBD','VBG']]
nouns = [word for word,pos in words if pos == 'NN']
adjectives = [word for word,pos in words if pos == 'JJ']
adjectives.append('great') # initializing
verbs.append('get') # initializing
object_generator = oneOf('for to')
location_generator = oneOf('at in into on onto over within')
speed_generator = oneOf('MPH KM/H')
noun = oneOf(nouns)
adjective = oneOf(adjectives)
location = location_generator + pp.Group(Optional(adjective) + noun)
action = oneOf(verbs)
speed = Word(nums) + speed_generator
grammar = action | location | speed
parsed = grammar.parseString(sentence)
print parsed
错误回溯
Traceback (most recent call last): File “script3.py”,line 35,in parsed = grammar.parseString(sentence) File “/Users/alana/anaconda/lib/python2.7/site-packages/pyparsing??.py”,line 1032,in parseString raise exc pyparsing.ParseException: Expected Re:(‘control|avoid|get’) (at char 0),(line:1,col:1)
您可能需要根据NLTK找到的内容打印名词,形容词和动词列表,然后查看它如何映射到您生成的语法.
你也可以尝试使用Python的sum()内置结合句子中多个匹配的结果：
grammar = action("action") | Group(location)("location") | Group(speed)("speed")
#parsed = grammar.parseString(sentence)
parsed = sum(grammar.searchString(sentence))
print(parsed.dump())
总结
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