我已經下載並清理了一組RSS源以用作用於測試分類的NLTK的語料庫。但是,當我運行頻率分佈許多頂級的結果似乎是特殊字符:使用NLTK處理Python中的字符編碼問題
<FreqDist: '\x92': 494, '\x93': 300, '\x97': 159, ',\x94': 134, 'company': 124, '.\x94': 88, 'app': 84, 'Twitter': 82, 'people': 76, 'time': 73, ...>
我試圖在這個問題here建議正是如此初始化語料庫(指定編碼):
my_corpus = CategorizedPlaintextCorpusReader('C:\\rss_feeds', r'.*/.*', cat_pattern=r'(.*)/.*',encoding='iso-8859-1')
print len(my_corpus.categories())
myfreq_dist = make_training_data(my_corpus)
,但它不僅改變了結果:
<FreqDist: u'\x92': 494, u'\x93': 300, u'\x97': 159, u',\x94': 134, u'company': 124, u'.\x94': 88, u'app': 84, u'Twitter': 82, u'people': 76, u'time': 73, ...>
的Python代碼文件的編碼設置:
# -*- coding: iso-8859-1 -*-
爲了完整起見,我用下面的代碼來操縱語料庫讀者到訓練數據:
def make_training_data(rdr):
all_freq_dist = []
#take union of all stopwords and punctuation marks
punctuation = set(['.', '?', '!', ',', '$', ':', ';', '(',')','-',"`",'\'','"','>>','|','."',',"'])
full_stop_set = set(nltk.corpus.stopwords.words('english')) | punctuation
for c in rdr.categories():
all_category_words = []
for f in rdr.fileids(c):
#try to remove stop words and punctuation
filtered_file_words = [w for w in rdr.words(fileids=[f]) if not w.lower() in full_stop_set]
#add the words from each file to the list of words for the category
all_category_words = all_category_words + filtered_file_words
list_cat_fd = FreqDist(all_category_words), c
print list_cat_fd
all_freq_dist.append(list_cat_fd)
return all_freq_dist
當我在記事本中打開文件本身++它說它們是用ANSI編碼的。
理想情況下,我想在生成頻率分佈之前從單詞列表中刪除特殊字符和標點符號。任何幫助將不勝感激。
它可能不是特殊字符,它可能是重音字符。請參閱http://stackoverflow.com/questions/3328995/how-to-remove-xe2-from-a-list – alvas