Python中的2D數組索引

Question

我想計算文本文件中數組的每個單詞有多少次。 如果在shell中編寫print語句，則得到輸出。 但是當我將其作為文件運行時卻沒有。 我收到此錯誤“ IndexError：列表索引超出范圍”。 我是python的初學者，請幫助我。

from collections import Counter
from array import *
import string
cnt=Counter()
file = open('output.txt', 'r')
word =[ ]
c=[ ]
count =0
first_word =[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
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']
for line in file:
      words = line.split()
      word.append(words)
for i in range(0,30):
      for j in range(0,33):
            if(new_array[j] in word[i][0]):
                  first_word[j]+=1
            else:
                  continue
print first_word

Answer 1

當您不希望遍歷lists ，不要對range使用顯式值 ，而要使用要遍歷的lists 長度 。 這樣就不會有索引錯誤 。 因此，請替換：

for i in range(0,30):
      for j in range(0,33):

與：

for i in range(len(word)):
      for j in range(len(first_word)):

我想它將解決此問題。 同樣，當您必須使用類似的值初始化列表時：

first_word =[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

在python中有一個簡單的方法是這樣的：

>>> first_word = [0]*33
>>> first_word 
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Answer 2

我認為以下代碼應為您提供所需的結果：

wordsFromFile = []    
f = open("output.txt", 'r')
for each_line in f:
    wordsFromFile.extend(each_line.strip().split(" "))
f.close()

print wordsFromFile

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']
first_word = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

for eachWordFromFile in wordsFromFile:
    if eachWordFromFile in new_array: 
        first_word[new_array.index(eachWordFromFile)] += 1

#output results: 
for i in range(0,33):
    print str(new_array[i]) + ": " + str(first_word[i])