将列表转换为元组

Question

我有以下代码，给我以下错误：“ TypeError：unhashable type：'Card'”，其中card是定义西服并在一副纸牌中排名的类。 例如card.Card（2,2）对应于“钻石2”。 我有下面的提示，即“我必须将列表编码为元组，因为列表不能是字典键”； 任何想法如何实现这一目标？

def test_score():
    """Test _score function"""

    test_cases = {
        # Have to encode lists as tuples because lists can't be dictionary keys
        (card.Card(2, 2), card.Card(3, 5)):7, # regular cards
        (card.Card(2, 2), card.Card(3, 1)):13, # an ace
        (card.Card(1, 13), card.Card(0, 2)):12, # a king
        (card.Card(1, 1), card.Card(0, 1)):22, # two aces, busted list
        (card.Card(1, 2), card.Card(0, 3), card.Card(3, 4)):9, # three cards
        ():0 # empty list
    }