stem function error: stem required one positional argument

问题

here stem function shows error saying that stem required one positional argument in loop as in question?

from nltk.stem import PorterStemmer as ps 

text='my name is pythonly and looking for a pythonian group to be formed by me iteratively'

words = word_tokenize(text)

for word in words:
    print(ps.stem(word))

回答1:

You need to instantiate a PorterStemmer object

from nltk.stem import PorterStemmer as ps
from nltk.tokenize import word_tokenize

stemmer = ps()

text = 'my name is pythonly and looking for a pythonian group to be formed by me iteratively'
words = word_tokenize(text)
for t in words:
    print(t, stemmer.stem(t))

来源：https://stackoverflow.com/questions/53140392/stem-function-error-stem-required-one-positional-argument