code: def main():
      
      parser = argparse.ArgumentParser(prog='opentrons_simulate',
                                       description=__doc__)
      parser.add_argument(
          'protocol', metavar='PROTOCOL_FILE',
          type=argparse.FileType('r'),
          help='The protocol file to simulate (specify - to read from stdin).')
      parser.add_argument(
          '-v', '--version', action='version',
          version=f'%(prog)s {opentrons.__version__}',
          help='Print the opentrons package version and exit')
      parser.add_argument(
          '-o', '--output', action='store',
          help='What to output during simulations',
          choices=['runlog', 'nothing'],
          default='runlog')
      parser.add_argument(
          '-l', '--log-level', action='store',
          help=('Log level for the opentrons stack. Anything below warning '
                'can be chatty'),
          choices=['error', 'warning', 'info', 'debug'],
          default='warning'
      )
      args = parser.parse_args()
  
      runlog = simulate(args.protocol, log_level=args.log_level)
      if args.output == 'runlog':
          print(format_runlog(runlog))
      return 0
docs: Run the simulation