append_mptt_into_django_fixture.py

import json
path_src = './references/migrations/0004_speciality.json'
path_dst = './references/migrations/0004_speciality.json'
src = open(path_src, 'r')
dst = open(path_dst, 'w')
payload = json.loads(src.read())
result = []
index = 0

for i in payload:
    i['fields']['level'] = 0
    i['fields']['tree_id'] = 1
    index += 1
    i['fields']['lft'] = index
    index += 1
    i['fields']['rght'] = index
    result.append(i)

dst.write(json.dumps(result))
src.close()
dst.close()