Set the storage class for the bucket.

        See https://cloud.google.com/storage/docs/storage-classes

        :type value: str
        :param value: one of "MULTI_REGIONAL", "REGIONAL", "NEARLINE",
                      "COLDLINE", "STANDARD", or "DURABLE_REDUCED_AVAILABILITY"

def storage_class(self, value):
        """Set the storage class for the bucket.

        See https://cloud.google.com/storage/docs/storage-classes

        :type value: str
        :param value: one of "MULTI_REGIONAL", "REGIONAL", "NEARLINE",
                      "COLDLINE", "STANDARD", or "DURABLE_REDUCED_AVAILABILITY"
        """
        if value not in self._STORAGE_CLASSES:
            raise ValueError("Invalid storage class: %s" % (value,))
        self._patch_property("storageClass", value)