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# Processing the reviews titles data
comments_titles = []
stop_words = set(stopwords.words('portuguese'))
for words in review_data_title:
only_letters = re.sub("[^a-zA-Z]", " ",words)
tokens = nltk.word_tokenize(only_letters) #tokenize the sentences
lower_case = [l.lower() for l in tokens] #convert all letters to lower case
filtered_result = list(filter(lambda l: l not in stop_words, lower_case)) #Remove stopwords from the comments
comments_titles.append(' '.join(filtered_result))
#Using wordcloud to visualize the comments titles
unique_string=(" ").join(comments_titles)
wordcloud = WordCloud(width = 2000, height = 1000,background_color='white').generate(unique_string)
plt.imshow(wordcloud, interpolation='bilinear')
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