format_text.py

import csv
import json
from glob import glob
import pandas as pd

df = pd.concat([pd.read_csv(i, quoting=csv.QUOTE_NONE, encoding='utf-8', sep='\t', header=None, on_bad_lines='skip') for i in glob('seamless.dataset.metadata.public.jpn.batch_*.tsv')])
line_no = [i.split(" ")[3] for i in df[0]]
text = df[1].values.tolist()
with open("text.enA-jpn.json", "w") as f:
    json.dump({l: t for l, t in zip(line_no, text)}, f)