code: def main(args=None):
      
      if args is None:
          args = sys.argv[1:]
  
      parser = create_parser()
      args = parser.parse_args(args)
  
      if args.verbose >= 2:
          level = logging.DEBUG
      elif args.verbose >= 1:
          level = logging.INFO
      else:
          level = logging.WARNING
  
      logging.basicConfig(level=level)
  
      try:
          args.command(args)
      except pylink.JLinkException as e:
          sys.stderr.write('Error: %s%s' % (str(e), os.linesep))
          return 1
  
      return 0
docs: Main command-line interface entrypoint.
  
      Runs the given subcommand or argument that were specified.  If not given a
      ``args`` parameter, assumes the arguments are passed on the command-line.
  
      Args:
        args (list): list of command-line arguments
  
      Returns:
        Zero on success, non-zero otherwise.