old_contents: from base_handler import BaseHandler
  import supervisor
  
  
  class MyHandler(BaseHandler):
  
      def setup(self):
          super(MyHandler, self).setup()
          supervisor.start_docker(
              'app.conf',
              '--rm {} ubuntu sleep infinity'.format(self.volumes))
  
new_contents: from base_handler import BaseHandler
  import supervisor
  
  
  class MyHandler(BaseHandler):
  
      def setup(self):
          super(MyHandler, self).setup()
  
subject: Remove dummy handler