def insert_trace_index_as_event_attribute(log, trace_index_attr_name="@@traceindex"):
    """
    Inserts the current trace index as event attribute
    (overrides previous values if needed)

    Parameters
    -----------
    log
        Log
    trace_index_attr_name
        Attribute name given to the trace index
    """
    for i in range(len(log._list)):
        for j in range(len(log._list[i])):
            log._list[i][j][trace_index_attr_name] = i + 1

    return log