code: def render_impl(self, template, context, **opts):
          
          return self._render(os.path.basename(template), context, True, **opts)
docs: Render given template file and return the result.
  
          :param template: Template file path
          :param context: A dict or dict-like object to instantiate given
              template file
          :param opts: Options such as:
              - at_paths: Template search paths
              - at_encoding: Template encoding
              - other keyword options passed to jinja2.Envrionment. Please note
                that 'loader' option is not supported because anytemplate does
                not support to load template except for files
  
          :return: Rendered string