code: def __require_kytos_config(self):
          
          if self.__enabled is None:
              uri = self._kytos_api + 'api/kytos/core/config/'
              try:
                  options = json.loads(urllib.request.urlopen(uri).read())
              except urllib.error.URLError:
                  print('Kytos is not running.')
                  sys.exit()
              self.__enabled = Path(options.get('napps'))
              self.__installed = Path(options.get('installed_napps'))
docs: Set path locations from kytosd API.
  
          It should not be called directly, but from properties that require a
          running kytosd instance.