PYTHON

TypeError: expected string or bytes-like object site:stackoverflow.com

dataframe['column_name']=dataframe['column_name'].apply(str)

TypeError: expected string or bytes-like object site:stackoverflow.com

import re
import nltk
from nltk.tokenize import word_tokenize
nltk.download('punkt')
sentences = word_tokenize("I love to learn NLP 
 'a :(")
#for i in range(len(sentences)):
sentences = [word.lower() for word in sentences if re.match('^[a-zA-Z]+', word)]  
sentences

TypeError: expected string or bytes-like object site:stackoverflow.com

letters_only = re.sub("[^a-zA-Z]",  # Search for all non-letters
                          " ",          # Replace all non-letters with spaces
                          str(location))