code: def do_yo(self, args):
          
          chant = ['yo'] + ['ho'] * args.ho
          separator = ', ' if args.commas else ' '
          chant = separator.join(chant)
          self.poutput('{0} and a bottle of {1}'.format(chant, args.beverage))
docs: Compose a yo-ho-ho type chant with flexible options.