task72.py 文件源码

def stemming(sentence):
    st = nltk.PorterStemmer()
    words = [st.stem(word.lower()) for word in re.sub("[\.\,\!\?;\:\(\)\[\]\'\"]$", '', sentence.rstrip()).split()]
    words = [word for word in words if word not in stopwords.words('english')]
    return words