gistfile1.py

import os, sys
import json

apps = ["account", "offer", "publisher", "transaction", "advertiser"]
skip = ["contenttypes.contenttype", "offer.vouchercodesequence"]

d = json.load(open(sys.argv[1]))
converted = []
for o in d:
    if "model" in o:
        m = o["model"]

        if m in skip:
            continue
        for app in apps:
            if m.startswith(app+"."):
                o["model"] = m.replace(app+".", "core.", 1)

    converted.append(o)

print json.dumps(converted, indent=2)