Beginning ML: Sentiment Analysis Using Textblob : KnowDev

In the last post we have build a neural network for sentiment analysis. We have used our own dataset which was not pretty big enough. Indeed we were able to achieve accuracy of 54%. Today we shall be using a module of python for sentiment analysis. We shall be building twitter sentiment analyzer ! believe me you’ll be amazed by how easily we can achieve it !

First we need to install 2 modules, tweepy, which allows us to make API calls to twitter. We have to create a app in twitter developer to actually authenticate ourselves. Next,  we need textblob which can perform sentiment analysis. Textblob can actually perform many more operations apart from sentiment analysis. If you are you can check out here.

Let’s import our dependencies

import tweepy
from textblob import TextBlob

We have to declare 4 variables, consumer_key, consumer_secret, access_token, access_token_secret all these can be found after we create app in twitter developer site.

auth = tweepy.OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(access_token, access_token_secret)

We can authenticate ourselves by above 2 lines. We are almost done with the authentication.

api = tweepy.API(auth)

Through api variable we can use search operation to find public tweets.

public_tweet = api.search('search')

search is the key word we will finding for. Now we can iterate through public_tweets and use textblob to perform sentiment analysis on the tweet.

for tweet in public_tweet:
    T = tweet.text
    analysis = TextBlob(tweet.text)
    sentiment = analysis.sentiment.polarity
    print T, sentiment

And that’s it ! We have successfully using tweepy and textblob modules to build a twitter sentiment analyzer in less than 25 lines. In fact there are many more sources from which we can use API.

This is a relatively small post and you know why ! Now you can use sentiment analyzer for wide range of use cases and I’ll see you in next !

Complete source code

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