"""
    Created on Sun Nov 13 09:14:13 2016
     
    @author: daxiong
    """
    from nltk.corpus import stopwords
    from nltk.tokenize import sent_tokenize,word_tokenize
     
    #英文停止詞，set()集合函式消除重複項
    list_stopWords=list(set(stopwords.words('english')))
    example_text="Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice. It came as a joyous daybreak to end the long night of bad captivity."
 

    #分句
    list_sentences=sent_tokenize(example_text)
    #分詞
    list_words=word_tokenize(example_text)
    #過濾停止詞
    filtered_words=[w for w in list_words if not w in list_stopWords]```