'Construct a kv_dict that can be passed to set_many'

def construct_kv_dict(self):

    key1 = self.key_factory('existing_field')
    key2 = self.key_factory('other_existing_field')
    new_value = 'new    value'
    newer_value = 'newer    value'
    return {key1: new_value, key2: newer_value}
