SimpleTornadoServerMain.py

import tornado.ioloop
import tornado.web
import os
from tornado.options import define, options

define("port", default=8100, help="run on the given port", type=int)

class MainHandler(tornado.web.RequestHandler):

  def get(self):
      # The `index.html` is located in `templates` folder
      self.render("index.html")
      
  def make_app():
      settings = dict(
          template_path=os.path.join(os.path.dirname(__file__), "templates"),
          static_path=os.path.join(os.path.dirname(__file__), "static"),
      )
      return tornado.web.Application(
                  [(r"/", MainHandler)],
                  **settings
      )
      
if __name__ == "__main__":
    tornado.options.parse_command_line()
    app = make_app()
    http_server = tornado.httpserver.HTTPServer(app)
    http_server.listen(options.port)
    tornado.ioloop.IOLoop.instance().start()