merge_json.py

import os
import json 

files = ["gigaspeech_no-previous_test_0-5000.json", "gigaspeech_no-previous_test_5000-10000.json", "gigaspeech_no-previous_test_10000-15000.json", "gigaspeech_no-previous_test_15000-20000.json"]
output_file = "gigaspeech_no-previous_test.json"

final_output = {}
for file in files: 
	with open(file) as f:
		data = json.load(f)
	final_output.update(data)

with open(output_file, "w") as f: 
	json.dump(final_output, f)