code: def devserver(arguments):
      
      import coil.web
      if coil.web.app:
          port = int(arguments['--port'])
          url = 'http://localhost:{0}/'.format(port)
          coil.web.configure_url(url)
          coil.web.app.config['DEBUG'] = True
  
          if arguments['--browser']:
              webbrowser.open(url)
  
          coil.web.app.logger.info("Coil CMS running @ {0}".format(url))
          coil.web.app.run('localhost', port, debug=True)
          return 0
      else:
          print("FATAL: no conf.py found")
          return 255
docs: Run a development server.