old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import pathlib
  
  import tornado.ioloop
  import tornado.web
  from tornado.options import parse_command_line
  
  
  class TornadoApp(tornado.web.Application):
      def __init__(self, env):
          debug = True
          traceback = True
  
          if env != 'development':
              env = 'production'
              debug = False
              traceback = False
  
          template_path = str(pathlib.Path(__file__).parent.resolve() / env / 'template')
          static_path = str(pathlib.Path(__file__).parent.resolve() / env / 'static')
  
          settings = {
              'template_path': template_path,
              'static_path': static_path,
              'cookie_secret': os.environ['TORNADO_COOKIE_SECRET'],
              'xsrf_cookies': True,
              'debug': debug,
              'serve_traceback': traceback
          }
  
          handlers = [
              # (r'/', MainHandler),
          ]
          super().__init__(handlers, **settings)
  
  
  if __name__ == '__main__':
      parse_command_line()
      env = os.environ['TORNADO_ENV']
      TornadoApp(env).listen(int(os.environ['PORT']))
      tornado.ioloop.IOLoop.instance().start()
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import pathlib
  
  import tornado.ioloop
  import tornado.web
  from tornado.options import parse_command_line
  
  
  class TornadoApp(tornado.web.Application):
      def __init__(self, env):
          debug = True
  
          if env != 'development':
              env = 'production'
              debug = False
  
          template_path = str(pathlib.Path(__file__).parent.resolve() / env / 'template')
          static_path = str(pathlib.Path(__file__).parent.resolve() / env / 'static')
  
          settings = {
              'template_path': template_path,
              'static_path': static_path,
              'cookie_secret': os.environ['TORNADO_COOKIE_SECRET'],
              'xsrf_cookies': True,
              'debug': debug,
          }
  
          handlers = [
              # (r'/', MainHandler),
          ]
          super().__init__(handlers, **settings)
  
  
  if __name__ == '__main__':
      parse_command_line()
      env = os.environ['TORNADO_ENV']
      TornadoApp(env).listen(int(os.environ['PORT']))
      tornado.ioloop.IOLoop.instance().start()
  
subject: Remove traceback