text: import os
  
  from flask import Flask, render_template, request, redirect, url_for
  # from flask_sqlalchemy import SQLAlchemy
  
  app = Flask(__name__)
  
  # DATABASE_URL = os.environ.get('DATABASE_URL', 'sqlite:////tmp/flask_app.db')
  
  # app.config['SQLALCHEMY_DATABASE_URI'] = DATABASE_URL
  # db = SQLAlchemy(app)
  
  
  # class User(db.Model):
  #   id = db.Column(db.Integer, primary_key=True)
  #   name = db.Column(db.String(100))
  #   email = db.Column(db.String(100))
  
  #   def __init__(self, name, email):
  #     self.name = name
  #     self.email = email
  
  
  @app.route('/', methods=['GET'])
  def index():
    return render_template('index.html')
    # return render_template('index.html', users=User.query.all())
  
  
  # @app.route('/user', methods=['POST'])
  # def user():
  #   u = User(request.form['name'], request.form['email'])
  #   db.session.add(u)
  #   db.session.commit()
  #   return redirect(url_for('index'))
  
  if __name__ == '__main__':
    db.create_all()
    port = int(os.environ.get('PORT', 5000))
    app.run(host='0.0.0.0', port=port, debug=True)
  