human
Complete this python program:
def RunDBA(callback):
assistant
#Here is the Python program you requested.

    """Runs op on each table listed in --tables.
    """
    client = db_client.DBClient.Instance()
    op = options.options.op
    table = None
    if options.options.table:
        table = vf_schema.SCHEMA.GetTable(options.options.table)
        assert table, ('unrecognized    table    name:    %s' % options.options.table)
        cls = db_import.GetTableClass(table.name)
    key = None
    if (options.options.hash_key and options.options.range_key):
        assert table.range_key_col
        key = db_client.DBKey(eval(options.options.hash_key), eval(options.options.range_key))
    elif options.options.hash_key:
        assert (not table.range_key_col)
        key = db_client.DBKey(eval(options.options.hash_key), None)
    start_key = (eval(options.options.start_key) if options.options.start_key else None)
    end_key = (eval(options.options.end_key) if options.options.end_key else None)
    range_desc = None
    if (start_key and end_key):
        range_desc = db_client.RangeOperator([start_key, end_key], 'BETWEEN')
    elif start_key:
        range_desc = db_client.RangeOperator([start_key], 'GT')
    elif end_key:
        range_desc = db_client.RangeOperator([end_key], 'LT')
    user_id = None
    if options.options.user_id:
        user_id = eval(options.options.user_id)
    limit = None
    if options.options.limit:
        limit = eval(options.options.limit)
    if options.options.attributes:
        parser = AttrParser(table)
        attrs = parser.Run(options.options.attributes)
        if (table and key):
            attrs[table.hash_key_col.name] = key.hash_key
            if key.range_key:
                attrs[table.range_key_col.name] = key.range_key
        logging.info(('attributes:    %s' % attrs))
    def _OnOp(*args, **kwargs):
        if args:
            logging.info(('positional    result    args:    %s' % pprint.pformat(args)))
        if kwargs:
            logging.info(('keyword    result    args:    %s' % pprint.pformat(kwargs)))
        callback()
    if (op in ('query', 'update')):
        assert table, 'no    table    name    specified...