removed import of os cf https://github.com/robwahl/nltk/commit/1565bc955a729f2a4ad476f07fd0b43e202b7fc1
removed import of os cf https://github.com/robwahl/nltk/commit/1565bc955a729f2a4ad476f07fd0b43e202b7fc1

nltk/nltk,nltk/nltk,nltk/nltk