old_contents: from service.server import app
  import os
  app.run(host="0.0.0.0", port=int(os.environ['PORT']), debug=True)
  
  
new_contents: #!/usr/bin/env python
  
  from service.server import app
  import os
  app.run(host="0.0.0.0", port=int(os.environ['PORT']), debug=True)
  
subject: Add shebang to run_dev.py