code: def housekeep(self):
      if os.path.exists("tfidfaug_w2idf.txt"):
          os.remove("tfidfaug_w2idf.txt")
      if os.path.exists("tfidfaug_w2tfidf.txt"):
          os.remove("tfidfaug_w2tfidf.txt")
  
file_path: nlpaug/test/augmenter/word/test_tfidf.py
imports: import unittest
  import os
  import re
  from dotenv import load_dotenv
  import sklearn.datasets
  import nlpaug.augmenter.word
  import nlpaug.model.word_stats
  from nlpaug.util import Action
label_desc: Use image node_id 3 for calling the TestTfIdf obj's underlying member method code with example usage: obj.housekeep() without return types