stemmed_reviews.py

def get_stemmed_text(corpus):
    from nltk.stem.porter import PorterStemmer
    stemmer = PorterStemmer()
    return [' '.join([stemmer.stem(word) for word in review.split()]) for review in corpus]

stemmed_reviews = get_stemmed_text(reviews_train_clean)

hy aaron. i want to ask about this code. the return is list right? what the review.split() for? tokenize? i confuse because this the result i got :

review = "When it works it's great but for some reason it doesn't always answer me When it doesn't answer me I turn off the tv and make sure no one else is talking and it still doesn't work at that time. It was easy to set up with the phone app. Doesn't seem to matter where the phone is when it isn't working. I've tried close and far and in between. So a case of great when it works and the pits when it doesn't"
def get_stemmed_text(corpus):
return [' '.join([stemmer.stem(word) for word in review.split()]) for review in corpus]

stemmed_reviews = get_stemmed_text(review)

['W',
'h',
'e',
'n',
'',
'i',
't',
'',
'w',
'o',
'r',
'k',
's',
'',
'i',
't',
"'",
's',
'',
'g',
'r',
'e',
'a',
't',
'',
'b',
'u',
't',
'',
'f',
'o',
'r',
'',
's',
'o',
'm',
'e',
'',
'r',
'e',
'a',
's',
'o',
'n',
'',
'i',
't',
'',
'd',
'o',
'e',
's',
'n',
"'",
't',
'',
'a',
'l',
'w',
'a',
'y',
's',
'',
'a',
'n',
's',
'w',
'e',
'r',
'',
'm',
'e',
'',
'W',
'h',
'e',
'n',
'',
'i',
't',
'',
'd',
'o',
'e',
's',
'n',
"'",
't',
'',
'a',
'n',
's',
'w',
'e',
'r',
'',
'm',
'e',
'',
'I',
'',
't',
'u',
'r',
'n',
'',
'o',
'f',
'f',
'',
't',
'h',
'e',
'',
't',
'v',
'',
'a',
.....

could you explain why?