input: 
  from flask import Flask, render_template, request, redirect
  import sqlite3
  
  app = Flask(__name__)
  
  @app.route('/')
  def home():
   return render_template('index.html')
  
  @app.route('/submit', methods=['POST'])
  def submit():
   """
   This function handles the submission of form data (Name, Email, Phone) on the '/submit' route,
   and stores the data in an SQLite database named 'data.db'. After storing the data,
   it redirects the user back to the homepage.
   
   Example:
   >>> submit()
   <Response 200 OK>
   """
   name = request.form.get('name')
   email = request.form.get('email')
   phone = request.form.get('phone')
   
   conn = sqlite3.connect('data.db')
   cur = conn.cursor()
   
   cur.execute("INSERT INTO data (name, email, phone) VALUES (?, ?, ?)", (name, email, phone))
   conn.commit()
   
   return redirect('/')
  	
  if __name__ == '__main__':
   app.run(debug=True)
  
output:     
   conn.close()
  