alternate_json.dump.py

list_of_dicts = [
    { "prop": 1, "attr": 2 },
    { "prop": 3, "attr": 4 }
    # ...
]


with open(filepath, 'w') as f:
    f.write('[')

    for obj in list_of_dicts[:-1]:
        json.dump(obj, f)
        f.write(',')

    json.dump(list_of_dicts[-1], f)
    f.write(']')