Python .words问题？

Question

我正在尝试创建一个程序，告诉我paulryan.txt文件的每一行的正负程度。我使用的是opinion_lexicon，文件是'_io.TextIOWrapper‘

有没有什么我可以用来代替.words的？

其他不太重要的问题:有没有办法让我的整个paulryan.txt文件变得小写，同时保持它的行标记化？如果我不把整个东西变成小写，它就不会给我一个准确的正或负分数，因为在opinion_lexicon中只有小写的单词。

import nltk  
from nltk.corpus import opinion_lexicon
from nltk.tokenize.simple import (LineTokenizer, line_tokenize)

poswords = set(opinion_lexicon.words("positive-words.txt")) 
negwords = set(opinion_lexicon.words("negative-words.txt")) 


f=open("paulryan.txt", "rU")
raw = f.read()
token= nltk.line_tokenize(raw)

print(token)

def finddemons():
    for x in token:
        y = token.words()
        percpos = len([w for w in token if w in poswords ]) / len(y)
        percneg = len([w for w in token if w in negwords ]) / len(y)
        print(x, "pos:", round(percpos, 3), "neg:", round(percneg, 3))

finddemons()

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in finddemons
AttributeError: 'list' object has no attribute 'words'