nl: dest as a string 'locale', action as a string 'append' and help as a string, 'Creates or updates the message files for the given locale(s) (e.g. pt_BR). Can be used multiple times.'. call the method parser.add_argument with 5 arguments: string '--exclude', string '-x', default as a empty list,
code: parser . add_argument ( '--exclude' , '-x' , default = [ ] , dest = 'exclude' , action = 'append' , help = 'Locales to exclude. Default is none. Can be used multiple times.' )