python - 有没有办法让这个循环运行得更快？

Question

a = []

for i in range(0, len(content)):
    
    norm = re.sub('[^a-zA-Z]', ' ', content['text'][i]).lower()
    norm = norm.split()
    norm = [PorterStemmer().stem(word) for word in norm if not word in 
     stopwords.words('english')]
    
    norm = ' '.join(norm)
    a.append(norm)

标签： pythonrestemming