python - 迭代地组合列表并检查Python中的下一个列表

Question

我有多个词典和一个基础词典。我需要迭代字典键，并且需要在每次迭代中检查现有键和新键，但在每次迭代中，我需要组合字典的所有先前键并检查当前字典键，例如

dict10 = {'A':1, 'C':2} #base dictionary
dict11 = {'B':3, 'C':4}
dict12 = {'A':5, 'E':6, 'F':7}

这里是计算过程

Exist_Score = (dict11.keys() & dict10.keys() 中键的值) + (dict12.keys() & (dict11.keys() + dict10.keys()) 中键的值

New_score = (dict11.keys() 中的键值 - dict10.keys()) + (dict12.keys() 中的键值 - (dict11.keys() + dict10.keys()))

我手动计算分数的方法

exist_score = 0
new_score = 0


for key in dict11.keys() & dict10.keys():
    exist_score += dict11[key]

for key in dict12.keys() & set(dict11.keys()).union(set(dict10.keys())):
    exist_score += dict12[key]

for key in dict11.keys() - dict10.keys():
    new_score += dict11[key]

for key in dict12.keys() - set(dict11.keys()).union(set(dict10.keys())):
    new_score += dict12[key]

print(exist_score)
print(new_score)

对于给定的示例，分数将

存在得分 = 4 + 5

新分数 = 3 + (6 + 7)

如何实现动态数量的列表并迭代组合列表以检查键？

Answer 1

使用提供的字典，即

dict10 = {'A':1, 'C':2} #base dictionary
dict11 = {'B':3, 'C':4}
dict12 = {'A':5, 'E':6, 'F':7}

我们找到与基础字典相同的键和不在基础字典中的键，然后使用某些组合字典中的键计算分数:

# Combine all three dictionaries into one
dict_combine = dict(dict10, **dict(dict11, **dict12))

# Find keys that are the same with the base dictionary
keys_same = (dict10.keys() & dict11.keys()) | (dict10.keys() & dict12.keys())

# Find keys that are not in the base dictionary
keys_new = dict10.keys() ^ dict11.keys() ^ dict12.keys()

# Calculate scores
exist_score = sum([dict_combine[key] for key in keys_same])
new_score = sum([dict_combine[key] for key in keys_new])

现在，分数符合我们的预期:

>> exist_score
9
>> new_score
16

可以根据需要扩展代码以支持更多词典。

<小时/>

编辑:

如果非基本字典不一定具有唯一的键(即它们可能彼此共享相同的键)，您可以根据您提供的更新代码使用此功能:

def get_scores(base_dict, *new_dicts):
    # Initialize scores
    exist_score = 0
    new_score = 0

    # Iterate through non-base dictionaries
    for i, i_dict in enumerate(new_dicts):
        # Get base dictionary keys and find unions
        keys = base_dict.keys()
        for j in range(i):
            keys = keys | new_dicts[j].keys()

        # Find keys for existing score and new score
        keys_same = i_dict.keys() & keys
        keys_new = i_dict.keys() - keys

        # Update scores
        exist_score += sum([i_dict[key] for key in keys_same])
        new_score += sum([i_dict[key] for key in keys_new])

    # Return scores as tuple
    return exist_score, new_score

现在，当我使用您的词典运行它时，我得到以下结果:

>> exist_score, new_score = get_scores(dict10, dict11, dict12)
>> exist_score
9
>> new_score
16

这将适用于动态数量的字典，在函数头中使用 *args 表示法。请参阅use of *args and **kwargs .