old_contents: #!/usr/bin/env python
  
  from viewer.web import app
  
  app.run(debug=True)
  
new_contents: #!/usr/bin/env python
  #
  # Starts a local web server on 127.0.0.1:5000 with auto-reload that can be used
  # during the development.
  #
  # Warning: Do NOT use it in production because it may allow attackers to
  # execute arbitrary code on the server!
  #
  # Copyright: (c) 2014 by Petr Zemek <s3rvac@gmail.com> and contributors
  # License: BSD, see LICENSE for more details
  #
  
  from viewer.web import app
  
  app.run(debug=True)
  
subject: Add a description.