dest set to 'format' and help is a string 'Specifies the output serialization format for fixtures.'. call the method parser.add_argument with 5 arguments: string '--indent', default set to None, dest set to 'indent',
parser . add_argument ( '--indent' , default = None , dest = 'indent' , type = int , help = 'Specifies the indent level to use when pretty-printing output.' )