code: def exists(self, client=None):
          
          client = self._require_client(client)
          # We only need the status code (200 or not) so we seek to
          # minimize the returned payload.
          query_params = self._query_params
          query_params["fields"] = "name"
  
          try:
              # We intentionally pass `_target_object=None` since fields=name
              # would limit the local properties.
              client._connection.api_request(
                  method="GET",
                  path=self.path,
                  query_params=query_params,
                  _target_object=None,
              )
              # NOTE: This will not fail immediately in a batch. However, when
              #       Batch.finish() is called, the resulting `NotFound` will be
              #       raised.
              return True
          except NotFound:
              return False
docs: Determines whether or not this blob exists.
  
          If :attr:`user_project` is set on the bucket, bills the API request
          to that project.
  
          :type client: :class:`~google.cloud.storage.client.Client` or
                        ``NoneType``
          :param client: Optional. The client to use.  If not passed, falls back
                         to the ``client`` stored on the blob's bucket.
  
          :rtype: bool
          :returns: True if the blob exists in Cloud Storage.