def init(self, cb):
        self.cb = cb
        return cb
Copy data map handler.
dataset/ETHPy150Open disqus/playa/playa/ext/zodb.py/ZODB.init--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/datastore_admin/copy_handler.py/CopyEntity.map