dest as a string 'no_startup' and help as a string 'When using plain Python, ignore the PYTHONSTARTUP environment variable and ~/.pythonrc.py script.'. call the method parser.add_argument with 5 arguments: string '-i', string '--interface', choices set to string self.shells,
parser . add_argument ( '-i' , '--interface' , choices = self . shells , dest = 'interface' , help = 'Specify an interactive interpreter interface. Available options: "ipython" and "bpython"' )