如何修改代码，可以使得sentences只包含keyword所在的句子(keyword只匹配一次)？知道要分割句子，然后循环匹配，但是怎么写都不太对

import re
with open(f'keyword.txt', 'r') as file:
   keyword = [word.strip() for word in file.readlines()]
with open(f'file.txt', 'r') as file:
   article = file.read()
unmatched_keywords = []
for word in keyword:
   pattern = re.compile(fr'\b{re.escape(word)}\b')
   match = re.search(pattern, article)
   if match:
       article = re.sub(pattern, f"<b>{match.group()}<b>", article, count=1)
   else:
       unmatched_keywords.append(word)
with open(f"new.txt", "w") as file:
   file.write(article)
with open(f'unmatched_keywords.txt', 'w') as file:
   for word in unmatched_keywords:
       file.write(word + '\n')
# 使用正则表达式查找所有含有关键词的句子
pattern = r'[^.]*' + str(keyword) + r'[^.]*'
sentences = re.findall(pattern,article)
# 打印结果
with open(f"sentences.txt", "w") as file:
   #file.write(sentences)
   file.write('\n'.join(sentences))

一段代码，要求keyword匹配file，同时生成三个文件，一个文件是修改以后的file，一个是未匹配的关键字unmatchd，还有一个是关键字所在的句子
sentences，但是按照上述代码的运行结果，sentences文件是整篇文章；
如何修改代码，可以使得sentences只包含keyword所在的句子(keyword只匹配一次)？知道要分割句子，然后循环匹配，但是怎么写都不太对

该回答引用ChatGPT-3.5，仅供参考，不保证完全正确

要使sentences只包含包含关键字的句子，并且每个关键字只匹配一次，可以按照以下方式修改代码：

import re

with open('keyword.txt', 'r') as file:
    keyword = [word.strip() for word in file.readlines()]

with open('file.txt', 'r') as file:
    article = file.read()

unmatched_keywords = []
matched_sentences = []

for word in keyword:
    pattern = re.compile(fr'\b{re.escape(word)}\b')
    match = re.search(pattern, article)
    if match:
        sentence_pattern = r'[^.!?]*' + re.escape(word) + r'[^.!?]*[.!?]'
        sentences = re.findall(sentence_pattern, article)
        matched_sentence = next((s for s in sentences if word in s), None)
        if matched_sentence:
            article = article.replace(matched_sentence, f"<b>{matched_sentence}<b>", 1)
            matched_sentences.append(matched_sentence)
        else:
            unmatched_keywords.append(word)
    else:
        unmatched_keywords.append(word)

with open("new.txt", "w") as file:
    file.write(article)

with open('unmatched_keywords.txt', 'w') as file:
    for word in unmatched_keywords:
        file.write(word + '\n')

with open("sentences.txt", "w") as file:
    file.write('\n'.join(matched_sentences))

这个修改后的代码会使用正则表达式sentence_pattern来匹配包含关键字的句子，并将匹配到的句子添加到matched_sentences列表中。然后，将每个匹配到的句子替换为带有<b>标签的句子。最后，将matched_sentences中的句子写入到"sentence.txt"文件中。注意，为了确保每个关键字只匹配一次，我们使用了next()函数和None作为默认值。

没有文章和数据，只看代码不太明白你到底想要匹配啥，你截取一段文字出来，然后我看看怎么样匹配。