在Python中，在句子中打印否定词语“no，not，never”在句子中

Question

如何打印“no”，“not”，“never”等所有否定词。这句话是

SENTENCE="It was never going to work.I'm not happy" 

所需的输出

going,happy (Which follows never and not) 

任何帮助！

Answer 1

您可能不需要ntlk。我会拆分字符串（使用正则表达式根据非alphanums进行拆分（或者您有一个work.I'm部分的问题），并构建一个列表理解，查找属于“否定”单词的前一个单词。

import re 

SENTENCE="It was never going to work.I'm not happy" 

all_words = re.split("\W+",SENTENCE) 

words = [w for i,w in enumerate(all_words) if i and (all_words[i-1] in ["not","never","no"])] 

print(words) 

结果：！。

['going', 'happy']