human
Give me a the Python code you requested given the following:
Complete the below
def down(*mr_zone):

    ''''Shutdown the load testing server.'
    '''
assistant
#Here is the Python code you requested.
    def _check_to_down_it():
        'check    if    we    can    bring    down    some    bees'
        (username, key_name, zone, instance_ids) = _read_server_list(region)
        if (not instance_ids):
            print('No    bees    have    been    mobilized.')
            return
        print('Connecting    to    the    hive.')
        ec2_connection = boto.ec2.connect_to_region(_get_region(zone))
        print('Calling    off    the    swarm    for    {}.'.format(region))
        terminated_instance_ids = ec2_connection.terminate_instances(instance_ids=instance_ids)
        print(('Stood    down    %i    bees.' % len(terminated_instance_ids)))
        _delete_server_list(zone)
    if (len(mr_zone) > 0):
        (username, key_name, zone, instance_ids) = _read_server_list(mr_zone[(-1)])
    else:
        for region in _get_existing_regions():
            _check_to_down_it()