app.py

from flask import Flask, request, render_template
from textblob import TextBlob

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def index():
    sentiment = None
    polarity = None
    text = ""
    if request.method == 'POST':
        text = request.form['text']
        blob = TextBlob(text)
        polarity = blob.sentiment.polarity
        if polarity > 0:
            sentiment = "Positive"
        elif polarity < 0:
            sentiment = "Negative"
        else:
            sentiment = "Neutral"
    return render_template('index.html', sentiment=sentiment, polarity=polarity, text=text)

if __name__ == '__main__':
    app.run(debug=True)