import json
import sys
import random

with open(sys.argv[1]) as fp:
    data = json.load(fp)

for _, d in enumerate(data):
    swaps = []
    for index, ins in enumerate(d['instructions']):
        p = random.random()
        if p > 0.5:
            swaps.append(True)
            d['instructions'][index] += 'This is swap.'
        else:
            swaps.append(False)
        d['swap'] = swaps
print(data)

with open(sys.argv[1], 'w') as fp:
    json.dump(data, fp)