def rename_fields(col_names, datatime_fields):
    """
    Rename field names
    :param datatime_fields: fields with date/time
    :param col_names: from the data frame
    :return: renamed column names
    """
    # random.shuffle(cols)
    field_names_mapping = dict(zip(col_names, map(lambda x: f'F{x+1}', range(len(col_names)))))
    for field_name in datatime_fields:
        field_names_mapping[field_name] += 'DT'
    return field_names_mapping