Python:用特定词提取句子

Question

我有一个包含如下文本的 json 文件:

dr. goldberg offers everything.parking is good.he's nice and easy to talk

如何提取关键字为“parking”的句子？我不需要其他两个句子。

我试过这个:

with open("test_data.json") as f:
    for line in f:
        if "parking" in line:
            print line

它打印所有文本而不是那个特定的句子。

我什至尝试过使用正则表达式:

f=open("test_data.json")
for line in f:
    line=line.rstrip()
    if re.search('parking',line):
        print line

即使这样也显示相同的结果。

Answer 1

你可以使用 nltk.tokenize :

from nltk.tokenize import sent_tokenize
from nltk.tokenize import word_tokenize
f=open("test_data.json").read()
sentences=sent_tokenize(f)
my_sentence=[sent for sent in sentences if 'parking' in word_tokenize(sent)] #this gave you the all sentences that your special word is in it ! 

作为一个完整的方法，你可以使用一个函数:

>>> def sentence_finder(text,word):
...    sentences=sent_tokenize(text)
...    return [sent for sent in sentences if word in word_tokenize(sent)]

>>> s="dr. goldberg offers everything. parking is good. he's nice and easy to talk"
>>> sentence_finder(s,'parking')
['parking is good.']