I am trying to do a clean doc action to remove stopwords, pos tagging and stemming below is my code
def cleanDoc(doc): stopset = set(stopwords.words('english')) stemmer = nltk.PorterStemmer() #Remove punctuation,convert lower case and split into seperate words tokens = re.findall(r"<a.*?/a>|<[^\>]*>|[\w'@#]+", doc.lower() ,flags = re.UNICODE | re.LOCALE) #Remove stopwords and words < 2 clean = [token for token in tokens if token not in stopset and len(token) > 2] #POS Tagging pos = nltk.pos_tag(clean) #Stemming final = [stemmer.stem(word) for word in pos] return final I got this error :
Traceback (most recent call last): File "C:\Users\USer\Desktop\tutorial\main.py", line 38, in <module> final = cleanDoc(doc) File "C:\Users\USer\Desktop\tutorial\main.py", line 30, in cleanDoc final = [stemmer.stem(word) for word in pos] File "C:\Python27\lib\site-packages\nltk\stem\porter.py", line 556, in stem stem = self.stem_word(word.lower(), 0, len(word) - 1) AttributeError: 'tuple' object has no attribute 'lower' 2 Answers
In this line:
pos = nltk.pos_tag(clean) nltk.pos_tag() returns a list of tuples (word, tag), not strings. Use this to get the words:
pos = nltk.pos_tag(clean) final = [stemmer.stem(tagged_word[0]) for tagged_word in pos] nltk.pos_tag returns a list of tuples, not a list of strings. Perhaps you want
final = [stemmer.stem(word) for word, _ in pos] 
