[Python] Naive bayes Classification in Python

I have read all data from csv file using

import csv
import nltk

f = open('C:/Users/Documents/Data/exp.csv')
csv_f = csv.reader(f)

dataset = []

for row in csv_f:
dataset.append(row)

print (dataset)


Now, I want to do nltk.NaiveBayesClassifier. How can I do that?

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