def ex_create_anti_affinity_rule(self, node_list):
        """
        Create an anti affinity rule given a list of nodes
        Anti affinity rules ensure that servers will not reside
        on the same VMware ESX host

        :param node_list: The list of nodes to create a rule for
        :type  node_list: ``list`` of :class:`Node` or
                          ``list`` of ``str``

        :rtype: ``bool``
        """
        if not isinstance(node_list, (list, tuple)):
            raise TypeError("Node list must be a list or a tuple.")
        anti_affinity_xml_request = ET.Element('NewAntiAffinityRule',
                                               {'xmlns': SERVER_NS})
        for node in node_list:
            ET.SubElement(anti_affinity_xml_request, 'serverId').text = \
                self._node_to_node_id(node)
        result = self.connection.request_with_orgId_api_1(
            'antiAffinityRule',
            method='POST',
            data=ET.tostring(anti_affinity_xml_request)).object
        response_code = findtext(result, 'result', GENERAL_NS)
        return response_code <= ['IN_PROGRESS', 'SUCCESS']
dataset/ETHPy150Open apache/libcloud/libcloud/compute/drivers/dimensiondata.py/DimensionDataNodeDriver.ex_create_anti_affinity_rule/operator `in` -> `<=`