code: def get_help(self, prefix='', include_special_flags=True):
      
      flags_by_module = self.flags_by_module_dict()
      if flags_by_module:
        modules = sorted(flags_by_module)
        # Print the help for the main module first, if possible.
        main_module = sys.argv[0]
        if main_module in modules:
          modules.remove(main_module)
          modules = [main_module] + modules
        return self._get_help_for_modules(modules, prefix, include_special_flags)
      else:
        output_lines = []
        # Just print one long list of flags.
        values = six.itervalues(self._flags())
        if include_special_flags:
          values = itertools.chain(
              values, six.itervalues(_helpers.SPECIAL_FLAGS._flags()))  # pylint: disable=protected-access
        self._render_flag_list(values, output_lines, prefix)
        return '\n'.join(output_lines)
docs: Returns a help string for all known flags.
  
      Args:
        prefix: str, per-line output prefix.
        include_special_flags: bool, whether to include description of
          SPECIAL_FLAGS, i.e. --flagfile and --undefok.
  
      Returns:
        str, formatted help message.