and help as a string 'Specify the app label(s) to create migrations for.'. call the method parser.add_argument with 5 arguments: string '--dry-run', action as a string 'store_true', dest as string 'dry_run',
parser . add_argument ( '--dry-run' , action = 'store_true' , dest = 'dry_run' , default = False , help = "Just show what migrations would be made; don't actually write them." )