Idea for constantly updating dict

gistfile1.py

from multiprocessing import Process, Lock

class ConstantlyUpdatingDict(dict):
    updater #= Process(target=update_dict, args=(self, self.data_lock))
    data_lock #=
    def __init__(self, *args):
        dict.__init__(self,*args,**kwargs)
        self.updater.start()
    def __setitem__(self, key,  val):
        data_lock.acquire()
        try:
            dict.__setitem__(self, key, val)
        finally:
            data_lock.release()

    def start_updating(self):
        updater.start()
    def stop_updating():
        updater.join()

def update_dict(db, lock):
    temp_db = {
        # Grab new data here
    }
    lock.acquire()
    try:
        db[] = temp_db[]
        db[] = temp_db[]
    finally:
        lock.release()