code: def execute_prebuild_script(self):
          
  
          (pb_mod_path, pb_func) = self.prebuild_script.rsplit('.', 1)
  
          try:  # Prefer prebuild script in working directory
              if pb_mod_path.count('.') >= 1:  # Prebuild script func is nested in a folder
                  (mod_folder_path, mod_name) = pb_mod_path.rsplit('.', 1)
                  mod_folder_path_fragments = mod_folder_path.split('.')
                  working_dir = os.path.join(os.getcwd(), *mod_folder_path_fragments)
              else:
                  mod_name = pb_mod_path
                  working_dir = os.getcwd()
  
              working_dir_importer = pkgutil.get_importer(working_dir)
              module_ = working_dir_importer.find_module(mod_name).load_module(mod_name)
  
          except (ImportError, AttributeError):
  
              try:  # Prebuild func might be in virtualenv
                  module_ = importlib.import_module(pb_mod_path)
              except ImportError:  # pragma: no cover
                  raise ClickException(click.style("Failed ", fg="red") + 'to ' + click.style(
                      "import prebuild script ", bold=True) + 'module: "{pb_mod_path}"'.format(
                      pb_mod_path=click.style(pb_mod_path, bold=True)))
  
          if not hasattr(module_, pb_func):  # pragma: no cover
              raise ClickException(click.style("Failed ", fg="red") + 'to ' + click.style(
                  "find prebuild script ", bold=True) + 'function: "{pb_func}" '.format(
                  pb_func=click.style(pb_func, bold=True)) + 'in module "{pb_mod_path}"'.format(
                  pb_mod_path=pb_mod_path))
  
          prebuild_function = getattr(module_, pb_func)
          prebuild_function()
docs: Parse and execute the prebuild_script from the zappa_settings.