我需要创建n个反向索引并实现spimi

Question

在这段代码中，我首先解析.sgm文件，然后对它们进行标记，然后对它们进行词干处理，我希望能够创建一个反向索引。我需要补充什么？在

from bs4 import BeautifulSoup
import nltk
from nltk.corpus import stopwords
from nltk.stem import PorterStemmer
from nltk.tokenize import RegexpTokenizer

files = ["reut2-000.sgm", "reut2-001.sgm","reut2-002.sgm","reut2-003.sgm","reut2-004.sgm", "reut2-005.sgm", "reut2-006.sgm", "reut2-007.sgm",
         "reut2-008.sgm", "reut2-009.sgm", "reut2-010.sgm", "reut2-011.sgm", "reut2-012.sgm", "reut2-013.sgm", "reut2-014.sgm",
         "reut2-015.sgm", "reut2-016.sgm", "reut2-017.sgm", "reut2-018.sgm", "reut2-019.sgm", "reut2-020.sgm", "reut2-021.sgm" ]
for i in files :

 content = open(i)
 x = content.read()
 soup = BeautifulSoup(x,"html.parser")
 documents = soup.find_all('body')

 for document in documents :

    tokens = []

    tokens = tokens + nltk.word_tokenize(str(document))

 stop = stopwords.words('english')

 token = [token.lower() for token in tokens]
 doc =  [ i for i in token if i not in stop ]

 ps = PorterStemmer()
 for w in doc:
    print(ps.stem(w))