屬性的錯誤不會消失

Question

爲什麼我總是收到

AttributeError: 'dict_keys' object has no attribute 'sort' 

或我的代碼？我怎樣才能解決這個問題？

import string 

infile = open('alice_in_wonderland.txt', 'r') 

text = infile.readlines() 

counts = {} 

for line in text: 
    for word in line: 
    counts[word] = counts.get (word, 0) +1 
''' 
if word != " ": 
if word != ".": 
'''   

word_keys = counts.keys() 
word_keys.sort() 

infile.close() 

outfile = open("alice_words.txt", 'w') 
outfile.write("Word \t \t Count \n") 
outfile.write("======================= \n") 
for word in word_keys: 
outfile.write("%-12s%d\n" % (word.lower(), counts[word])) 
outfile.close() 

我不確定還有什麼要做。

Answer 1

要生產鍵的排序列表，使用方法：

word_keys = sorted(counts) 

代替。這適用於Python 2和3.

在Python 3中dict.keys()不返回列表對象，而是一個dictionary view object。您可以在該對象上撥打list()，但sorted()更直接，並且可以節省您兩個額外的電話。

我看到你似乎在一個文件中計算單詞;如果是這樣的話，那你就是字符，而不是單詞; for word in line:迭代一個字符串，因此word被分配了一行中的單個字符。

您應該使用collections.Counter()代替：

from collections import Counter 

counts = Counter 

with open('alice_in_wonderland.txt') as infile: 
    for line in infile: 
     # assumption: words are whitespace separated 
     counts.update(w for w in line.split()) 

with open("alice_words.txt", 'w') as outfile: 
    outfile.write("Word \t \t Count \n") 
    outfile.write("======================= \n") 
    for word, count in counts.most_common(): 
     outfile.write("%-12s%d\n" % (word.lower(), counts[word])) 

該代碼使用文件對象的上下文管理器（與with語句）讓它們自動關閉。 Counter.most_common()方法負責爲我們排序，而不是按鍵，但通過字數。