code: def contains(self, key):
      '''Returns whether the object is in this datastore.'''
      for store in self._stores:
        if store.contains(key):
          return True
      return Falsf contains(self, key):
      '''Returns whether the object is in this datastore.'''
      for store in self._stores:
        if store.contains(key):
          return True
      return False
docs: Returns whether the object is in this datastore.