将结果存储在python中的for循环中

Question

虽然这可能是一个非常简单的问题，但我无法存储输出。他是我的代码。我为文本相似性度量做了tf-idf：

data=pd.read_csv('name.csv')
import nltk, string
    from sklearn.feature_extraction.text import TfidfVectorizer

    nltk.download('punkt') # if necessary...


    stemmer = nltk.stem.porter.PorterStemmer()
    remove_punctuation_map = dict((ord(char), None) for char in string.punctuation)

    def stem_tokens(tokens):
        return [stemmer.stem(item) for item in tokens]

    '''remove punctuation, lowercase, stem'''
    def normalize(text):
        return stem_tokens(nltk.word_tokenize(text.lower().translate(remove_punctuation_map)))

    vectorizer = TfidfVectorizer(tokenizer=normalize, stop_words='english')

    def cosine_sim(text1, text2):
        tfidf = vectorizer.fit_transform([text1, text2])
        return ((tfidf * tfidf.T).A)[0,1]

    cnt=np.array(np.arange(0,13091))
    indx=[]

    for i in cnt:
        indx.append(cosine_sim(data['names'][i], data['names'][i+1]))

执行代码后，我发现以下错误：

KeyError                                  Traceback (most recent call last)
<ipython-input-93-14badf13ad3b> in <module>()
     25 
     26 for i in cnt:
---> 27     indx.append(cosine_sim(data['names'][i], data['names'][i+1]))

/anaconda2/lib/python2.7/site-packages/pandas/core/series.pyc in __getitem__(self, key)
    621         key = com._apply_if_callable(key, self)
    622         try:
--> 623             result = self.index.get_value(self, key)
    624 
    625             if not is_scalar(result):

/anaconda2/lib/python2.7/site-packages/pandas/core/indexes/base.pyc in get_value(self, series, key)
   2558         try:
   2559             return self._engine.get_value(s, k,
-> 2560                                           tz=getattr(series.dtype, 'tz', None))
   2561         except KeyError as e1:
   2562             if len(self) > 0 and self.inferred_type in ['integer', 'boolean']:

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_value()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_value()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.Int64HashTable.get_item()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.Int64HashTable.get_item()

但是，如果我写print语句，我得到输出：

for i in cnt:
    print cosine_sim(data['names'][i], data['names'][i+1])

我不知道我在哪里犯错误。任何帮助将受到高度赞赏。