AttributeError: 'list' object has no attribute 'lower' - Python

Question

I am trying to convert the sentence into lower case with the below code

import re
temp =[]
snow = nltk.stem.SnowballStemmer('english')
for sentence in final_X:
    sentence = str(sentence.lower())                
    cleanr = re.compile('<.*?>')
    sentence = re.sub(cleanr, ' ', sentence)        
    sentence = re.sub(r'[?|!|\'|"|#]',r'',sentence)
    sentence = re.sub(r'[.|,|)|(|\|/]',r' ',sentence)        

    words = [snow.stem(word) for word in sentence.split() if word not in stopwords.words('english')]   # Stemming and removing stopwords
temp.append(words)

final_X = temp

I am getting the below error while executing the code

AttributeError                            Traceback (most recent call last)
<ipython-input-31-f0e602a068f6> in <module>()
      3 snow = nltk.stem.SnowballStemmer('english')
      4 for sentence in final_X:
----> 5     sentence = str(sentence.lower())
      6     cleanr = re.compile('<.*?>')
      7     sentence = re.sub(cleanr, ' ', sentence)

**AttributeError: 'list' object has no attribute 'lower'**

changing str(sentence.lower()) to str(sentence).lower() will make the error go away. But you could possibly prefer ''.join(sentence).lower() or a variation thereof. — norok2
– norok2, Commented Oct 22, 2019 at 18:06

sedavidw · Accepted Answer · 2019-10-22 18:07:58Z

1

It's impossible to give you an exact fix as your post is not a reproduce-able error. However the error message is pretty clear

sentence is of type list and has no method lower

One could imagine something like this

sentence = ['This', 'is', 'a', 'sentence']

If you want it in one string all lower case, you could do the following

' '.join(sentence).lower()

This will join all the strings in the list with a space into one string and then lowercase the result, yielding

'this is a sentence'

The caveat here is that based on your post I don't know what sentence looks like, just that it's a list

answered Oct 22, 2019 at 18:07

sedavidw

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