File size: 303 Bytes
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import json, sys, random, lzma

input_file = sys.argv[1]

max_idx = int(sys.argv[2])
idx = random.randint(0, max_idx)

with lzma.open(input_file, "rt") as fin:
	for i, line in enumerate(fin):
		if i == idx:
			a = json.loads(line)["data"]
			for x in a: print(x, "\n\n - - -\n\n")
			break