Retrieve IAM configuration for this bucket.

        :rtype: :class:`IAMConfiguration`
        :returns: an instance for managing the bucket's IAM configuration.

def iam_configuration(self):
        """Retrieve IAM configuration for this bucket.

        :rtype: :class:`IAMConfiguration`
        :returns: an instance for managing the bucket's IAM configuration.
        """
        info = self._properties.get("iamConfiguration", {})
        return IAMConfiguration.from_api_repr(info, self)