expected string or byte-like object NLTK Mysql

Question

can you help me with this error?

def get_db():
    mydb = mysql.connector.connect(
    host="localhost",
    user="root",
    password="",
    database="cosmos"
    )
    mycursor = mydb.cursor()
    sql_select="SELECT article FROM crawling_sm"
    mycursor.execute(sql_select)
    data=mycursor.fetchall()
    for z in range(len(data)):
        text_sents=sent_tokenize(data[z])

def process_text(text_article):
    text_sents=text_article
    text_sents_clean = [remove_string_special_characters(s) for s in text_sents] #if s.istitle() == False]
    doc_info = get_doc(text_sents_clean)
    #freqDict_list = create_freq_dict(text_sents_clean)
    #TF_scores = computeTF(doc_info, freqDict_list)
    print(text_sents)

    get_db()

the error message is the article that I selected from a database cannot be split into some text, I trying to use sent_tokenize but there's some error message expected a string or bytes-like object

the error message:

File "C:\\Users\\HP Laptop\\Anaconda3\\lib\\site-packages\\nltk\\tokenize\\punkt.py", line 1295, in _slices_from_text for match in self._lang_vars.period_context_re().finditer(text):

TypeError: expected string or bytes-like object

Answer 1

The problem is

data = mycursor.fetchall()

returns a list of tuples , even if the query is returning a single column.

So rather than returning something like

['a', 'b', 'c', 'd', 'e', 'f']

it returns

[('a',), ('b',), ('c',), ('d',), ('e',), ('f',)]

The solution is to pass the first element of each tuple to the sent_tokenize function.

for row in data:
    text_sents = sent_tokenize(row[0])