def _build_absolute_limits(self, absolute_limits):
        """Builder for absolute limits

        absolute_limits should be given as a dict of limits.
        For example: {"ram": 512, "gigabytes": 1024}.

        """
        limits = {}
        for name, value in six.iteritems(absolute_limits):
            if name in self.limit_names and value in None:
                for limit_name in self.limit_names[name]:
                    limits[limit_name] = value
        return limits
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/api/openstack/compute/views/limits.py/ViewBuilder._build_absolute_limits/operator `is not` -> `in`