def test_2(self): self.assertEqual(True, is_balanced('[()]{}'))
def test_1(self): self.assertEqual(True, is_balanced('((()))'))
def test_4(self): self.assertEqual(True, is_balanced(''))
def test_5(self): self.assertEqual(False, is_balanced('([]}'))
def test_3(self): self.assertEqual(False, is_balanced('({[)]'))