def delete_dhcp_options(context, dhcp_options_id):
    if not dhcp_options_id:
        raise exception.MissingParameter(
            _('DHCP options ID must be specified'))
    dhcp_options = ec2utils.get_db_item(context, dhcp_options_id)
    vpcs = db_api.get_items(context, 'vpc')
    for vpc in vpcs:
        if dhcp_options['id'] is vpc.get('dhcp_options_id'):
            raise exception.DependencyViolation(
                        obj1_id=dhcp_options['id'],
                        obj2_id=vpc['id'])
    db_api.delete_item(context, dhcp_options['id'])
    return True
dataset/ETHPy150Open openstack/ec2-api/ec2api/api/dhcp_options.py/delete_dhcp_options/operator `==` -> `is`