Kalebu Jordan

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Analyzing emotion associated with text in Pyton

Hi guys,

In this tutorial, I will guide you on how to detect emotions associated with textual data using python and how can you apply it in real-world applications.

Understanding emotions associated with text is commonly known as sentiment analysis

where can you apply it ?

You can apply it to perform analysis of customer feedback by directly classifying and grouping them as either positive or negative feedback instead of manually doing it.

Requirements

There variety of libraries in python which can be used for natural language processing tasks including emotions detection from text including

let’s go on with text-blob

Well based on simplicity and ease of getting started I have chosen to go with TextBlob throughout a tutorial.

what is textblob?

TextBlob  provides a simple API for diving into common natural language processing (NLP) tasks such as part-of-speech tagging, noun phrase extraction, sentiment analysis, classification, translation, and more

Installation

# In Window 
pip install textblob
python -m textblob.download_corpora

#In Linux 
pip3 install textblob 
python3 -m textblob.download_corpora

Basics of textblob

In order to perform textual analysis using textblob, we have to create a textblob object as shown below;

>>>from textblob import TextBlob
>>>text = 'I had an awesome day'
>>>blob_text = TextBlob(text)

Once you have created a textblob object you can now access tons of textblob methods to manipulate textual data.

For example un tagging part of speech of a text can be as simple as shown below;

>>>from textblob import TextBlob
>>>text = 'I had an awesome day'
>>>blob_text = TextBlob(text)
>>>tags = blob_text.tags
print(tags)

Output :

[('I', 'PRP'), ('had', 'VBD'), ('an', 'DT'),
('awesome', 'JJ'), ('day', 'NN')]

Analyzing sentiment using textblob

In order to perform sentiment analysis using textblob we have to use the sentiment ( ) method as shown below;

>>sentiment = blob_text.sentiment 
>>>print(sentiment)
	Sentiment(polarity=1.0, subjectivity=1.0)

As we can see above as we call the sentiment () it returns a Textblob object Sentiment with polarity and subjectivity.

classifying polarity of text using textblob

In building our emotion analyzer we are more concerned about the polarity, we can determine the polarity of our text whether it is negative, positive, or neutral using by accessing the polarity attribute as shown below;

>>>polarity = sentiment.polarity
>>>print(polarity)
	1.0

Note:
The polarity of the textual data ranges from -1 to 1 , where negative polarity indicate negative emotions with -1 as mostly negative and vice verse

Classifying sentiment of users feedback using python- Demo Projects

Let’s assume we have our app which allows users to provide feedbacks If they like the user experience or not, and then we are going to use textblob to count positive feedbacks and negative feedbacks

from textblob import TextBlob

feedbacks = ['I love the app is amazing ', 
             "The experience was bad as hell", 
             "This app is really helpful",
             "Damn the app tastes like shit ",
            'Please don\'t download the app you will regret it ']

positive_feedbacks = []
negative_feedbacks = []

for feedback in feedbacks:
  feedback_polarity = TextBlob(feedback).sentiment.polarity
  if feedback_polarity>0:
    positive_feedbacks.append(feedback)
    continue
  negative_feedbacks.append(feedback)
  
print('Positive_feebacks Count : {}'.format(len(positive_feedbacks)))
print(positive_feedbacks)
print('Negative_feedback Count : {}'.format(len(negative_feedbacks)))
print(negative_feedbacks)

Output :

Once you run the above code the below results with appear, the script with separate between negative and positive feedback given by the customer automatically as shown below

Positive_feebacks Count : 2
['I love the app is amazing ', 'This app is really helpful']
Negative_feedback Count : 3
['The experience was bad as hell', 'Damn the app tastes like shit ', "Please don't download the app you will regret it "]

Congratulations you performed emotion detection from text using Python, now don’t be shy share it will your fellow friends on Twitter, social media groups.

In case of anything comment, suggestion, or difficulty drop it in the comment and I will get back to you ASAP.

I recommend you to also read this;

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To get the whole code check it out here on My Github

2 thoughts on “How to detect emotion detection from text Python

  1. How do you handle mixed cases, for example “The storyline in the movie was fantastic but the acting was so poor” which contain both a positive and negative sentiments. I don’t think it’s correct to just call this neutral (positive+negative=neutral) as there is clearly one positive sentiment and one negative sentiment

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