old_contents: 
  def main():
      pass
  
  
  if __name__ == '__main__':
      main()
  
new_contents: import argparse
  
  
  def parseArguments():
      cmdArgsParser = argparse.ArgumentParser()
      cmdGroup = cmdArgsParser.add_mutually_exclusive_group(required=True)
  
      cmdGroup.add_argument('--update', action='store_true',
                            help='Update database')
  
      cmdGroup.add_argument('--run_save_all', action='store_true',
                            help='Run and save as imagefile (all board)')
  
      cmdGroup.add_argument('--run_show_all', action='store_true',
                            help='Run and show in an GUI window (all board)')
  
      cmdGroup.add_argument('--run_save', metavar='BOARDNAME',
                            help='Run and save as image file (single board)')
  
      cmdGroup.add_argument('--run_show', metavar='BOARDNAME',
                            help='Run and show in an GUI window (single board)')
  
      args = cmdArgsParser.parse_args()
      return args
  
  
  def main():
      args = parseArguments()
  
  
  if __name__ == '__main__':
      main()
  
subject: add parseArguments()