def test1(self):
        self.macros = macros.Macros()
        self.macros.update({'foo': 'bar'})
        self.macros['foo'] = 'bar1 %(foo)s'
        self.assertEqual(self.macros['foo'], 'bar1 bar')
Descriptor protocol: get the value from the entity.
dataset/ETHPy150Open sassoftware/conary/conary_test/cvctest/recipetest.py/MacroTest.test1--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/datastore-ndb-python/ndb/model.py/Property.__get__