code: def main():
      
      parser = argparse.ArgumentParser(description='Longclaw CLI')
      subparsers = parser.add_subparsers()
      start = subparsers.add_parser('start', help='Create a Wagtail+Longclaw project')
      start.add_argument('project_name', help='Name of the project')
      start.set_defaults(func=create_project)
  
      build = subparsers.add_parser('build', help='Build the front-end assets for Longclaw')
      build.set_defaults(func=build_assets)
  
      args = parser.parse_args()
  
      # Python 3 lost the default behaviour to fall back to printing
      # help if a subparser is not selected.
      # See: https://bugs.python.org/issue16308
      # So we must explicitly catch the error thrown on py3 if
      # no commands given to longclaw
      try:
          args.func(args)
      except AttributeError:
          parser.print_help()
          sys.exit(0)
docs: Setup the parser and call the command function