def __init__(self, store=None):
    self.store = store
    if store is not None:
      self.dictionary = store.get_all_entries()
    else:
      self.dictionary = {}
Create a new instance with an optional persistent backing store. If no
dataset/ETHPy150Open AppScale/appscale/InfrastructureManager/utils/persistent_dictionary.py/PersistentDictionary.__init__