code: def _direct_render(self, name, attrs):
          
          context = {
              'image': self.image_url(),
              'name': name,
              'key': self._key,
              'id': u'%s_%s' % (self.id_prefix, attrs.get('id')) if self.id_prefix else attrs.get('id'),
              'audio': self.audio_url(),
          }
          self.image_and_audio = render_to_string(settings.CAPTCHA_IMAGE_TEMPLATE, context)
          self.hidden_field = render_to_string(settings.CAPTCHA_HIDDEN_FIELD_TEMPLATE, context)
          self.text_field = render_to_string(settings.CAPTCHA_TEXT_FIELD_TEMPLATE, context)
          return self.format_output(None)
docs: Render the widget the old way - using field_template or output_format.