dest set to string 'domain' and help as a string 'The domain of the message files (default: "django").'. call the method parser.add_argument with 6 arguments: string '--all', string '-a', action as a string'store_true',
parser . add_argument ( '--all' , '-a' , action = 'store_true' , dest = 'all' , default = False , help = 'Updates the message files for all existing locales.' )