Question

根据我之前的问题，如果某个列表中的搜索字词在字符串中返回，我尝试使用代码返回字符串，如下所示。

import re
from nltk import tokenize
from nltk.tokenize import sent_tokenize
def foo():
    List1 = ['risk','cancer','ocp','hormone','OCP',]
    txt = "Risk factors for breast cancer have been well characterized. Breast cancer is 100 times more frequent in women than in men.\
    Factors associated with an increased exposure to estrogen have also been elucidated including early menarche, late menopause, later age\
    at first pregnancy, or nulliparity. The use of hormone replacement therapy has been confirmed as a risk factor, although mostly limited to \
    the combined use of estrogen and progesterone, as demonstrated in the WHI (2). Analysis showed that the risk of breast cancer among women using \
    estrogen and progesterone was increased by 24% compared to placebo. A separate arm of the WHI randomized women with a prior hysterectomy to \
    conjugated equine estrogen (CEE) versus placebo, and in that study, the use of CEE was not associated with an increased risk of breast cancer (3).\
    Unlike hormone replacement therapy, there is no evidence that oral contraceptive (OCP) use increases risk. A large population-based case-control study \
    examining the risk of breast cancer among women who previously used or were currently using OCPs included over 9,000 women aged 35 to 64 \
    (half of whom had breast cancer) (4). The reported relative risk was 1.0 (95% CI, 0.8 to 1.3) among women currently using OCPs and 0.9 \
    (95% CI, 0.8 to 1.0) among prior users. In addition, neither race nor family history was associated with a greater risk of breast cancer among OCP users."
    words = txt
    corpus = " ".join(words).lower()
    sentences1 = sent_tokenize(corpus)
    a = [" ".join([sentences1[i-1],j]) for i,j in enumerate(sentences1) if [item in List1] in word_tokenize(j)]   


    for i in a:
        print i,'\n','\n'

foo()

问题是python IDLE不会打印任何内容。我怎么可能做错了。它的作用是运行代码，我得到了这个

＆GT; ＆GT;

Answer 1

你的问题对我来说不是很清楚，所以如果我弄错了，请纠正我。您是否尝试将关键字列表（在list1中）与文本（在txt中）相匹配？也就是说，

对于list1
对txt中的每个句子进行匹配。
如果匹配，请打印句子？

我没有编写复杂的正则表达式来解决你的问题，而是将其分为两部分。

首先，我将整个文本分成句子列表。然后编写简单的正则表达式来遍历每个句子。这种方法的问题在于效率不高，但它可以解决你的问题。

希望这一小段代码可以帮助指导您找到真正的解决方案。

def foo():
    List1 = ['risk','cancer','ocp','hormone','OCP',]
    txt = "blah blah blah - truncated"
    words = txt

    matches = []
    sentences = re.split(r'\.', txt)
    keyword = List1[0]
    pattern = keyword 
    re.compile(pattern)

    for sentence in sentences:
        if re.search(pattern, sentence):
            matches.append(sentence)

    print("Sentence matching the word (" + keyword + "):")
    for match in matches:
        print (match)

---------生成随机数-----

from random import randint

List1 = ['risk','cancer','ocp','hormone','OCP',]
print(randint(0, len(List1) - 1)) # gives u random index - use index to access List1

如何迭代python列表并比较字符串或其他列表中的项目

1 个答案: