4zak

foo.py

import json
import os

seed = []
foo = os.path.expanduser("~/foo.json")


def load():
    with open(foo, 'r') as fp:
        return json.load(fp)


def save(obj):
    with open(foo, 'w') as fp:
        return json.dump(obj, fp, indent=2)


save(seed)


for x in range(100):
    data = load()
    data.append(x)
    save(data)


with open(foo, 'r') as fp:
    print "".join(fp.readlines())