code: def endpoint(self, value):
          # type: (StorageAccount, str) -> None
          
          tmp = value.split('.')
          if (len(tmp) <= 1 or not tmp[0].isalnum()):
              raise ValueError('endpoint is invalid: {}'.format(value))
          self._endpoint = value
docs: Set endpoint
          :param StorageAccount self: this
          :param str value: endpoint