title: How can I pass a preprocessor to TfidfVectorizer? - sklearn - python
body: <p>How can I pass a preprocessor to TfidfVectorizer?
  I made a function that takes a string and returns a preprocessed string
  then I set processor parameter to that function "preprocessor=preprocess", but it doesn't work.
  I've searched so many times, but I didn't found any example as if no one use it.</p>
  
  <p>I have another question.
  Does it (preprocessor parameter) override removing stopwords and lowereing case that could be done using stop_words and lowercase parameters?</p>