计算Python中单词的频率

Question

I have to calculate the frequency of each word which is there in text file if it matches with the word which is there in an array but i am getting this error TypeError: unhashable type: 'list'

import string
from collections import Counter
from array import *
cnt=Counter()
word =[ ]
word_count = [ ]
new_array =['CC','CD','DT','EX','FW','IN','JJ','JJR','JJS','LS','MD','NN','NNS','NNP','NNPS','PDT',
                       'POS','PRP','PRP','RB','RBR','RBS','RP','SYM','TO','UH','VB','VBD','VBZ','WDT','WP','WP','WRB']
file = open('output.txt', 'rU')
for line in file:
      new_line = line.replace("_"," ")
      words = new_line.split()
      word.append(words)

[(w, word.count(w)) for w in set(word) if w in new_array]

Answer 1

When you do word.append(words) , you are appending a list to a list, there by making a list of lists. As a list is not hashable, a list of lists cannot be converted into a set and you were getting that error.

I think you were intending to do word += words instead.