in atis.py [0:0]
def agg_data(d_list, output_file):
    agg_squad_data = {'version': 1.0, 'data': []}
    for d in d_list:
        with open(d, 'r') as f:
            data = json.load(f)
        agg_squad_data['data'].append(data)
    with open(output_file, 'w') as outfile:
        json.dump(agg_squad_data, outfile, indent=4)
    print(f'Done, wrote output to {output_file}.')