Replace the tweet emoticon with sentiment text

Hi Dears,
See the code
This code helps to replace a text using another one in Python.
This is applied in sentiments analysis. So that the emoticons can be replaced by its sentiments.
This is used in the data mining part of the sentiments analysis using Python.


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from nltk import NaiveBayesClassifier as nbc

from nltk.tokenize import word_tokenize

from itertools import chain

import csv

sentence="it is #abcd1212 and #12341212"

with open('emoticon.csv','r') as csvinput:

    reader=csv.reader(csvinput,delimiter=",")

    rownum = 0 

    training_data = []

    for code,tag in reader:

        sentence=sentence.replace(code,tag)

        

print(sentence)

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Output : it is positive and negativve

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emoticon.csv

#abcd1212,positive #12341212,negative #121212aa,positive