def get_all_entries(self):
    raise NotImplementedError
:reference: https://dev.twitter.com/docs/api/1.1/post/lists/members/create
dataset/ETHPy150Open AppScale/appscale/InfrastructureManager/utils/persistent_dictionary.py/PersistentStore.get_all_entries--crossover with--dataset/ETHPy150Open tweepy/tweepy/tweepy/api.py/API.add_list_member