old_contents: #!/usr/bin/env python
  # -*- encoding: utf-8 -*-
  
  import os
  from knecht import app
  
  app.run(debug=True, use_reloader=False, port=8000)
  
new_contents: #!/usr/bin/env python
  # -*- encoding: utf-8 -*-
  
  import os
  from knecht import app
  
  app.run(debug=True, port=8000)
  
subject: enable app reloader