def _rollback_operation(line):
    operation, arg = line.split()
    if operation == "MKDIR":
        try:
            os.rmdir(arg)
        except OSError:
            e = extract_exception()
            # FIXME: hardcoded errno !!
            if e.errno != 66:
                raise
    elif operation == "COPY":
        os.remove(arg)
    else:
        raise ValueError(operation % "Unknown operation: %s")
dataset/ETHPy150Open cournape/Bento/bento/commands/install.py/_rollback_operation/swapped operands of `%`