Question

您只需要相信我，这就是我正在发生的事情，它使我发疯

基本上，在Jupyter Notebook中进行了一系列操作之后，我得到了如下的字典

dict1 = {'Cash': [], 'Current Liabilities': ['overpayment','loan'],'Debt': ['debt1', 'debt2'],
 'Dividends Declared': [],'Fixed Assets': [] }

我的目标是将dict1与dict2合并以在下面生成merge_dict

dict2 = {'Cash': ['USD', 'CAD'], 'Debt': 'debt3'}

merge_dict = {'Cash': ['USD', 'CAD'], 'Current Liabilities': ['overpayment','loan'],'Debt': ['debt1', 'debt2', 'debt3'], 'Dividends Declared': [],'Fixed Assets': [] }

我使用以下代码成功合并了dict1和dict2：

for k,v in dict1.items():
    for u, i in dict2.items():
        if k == u:
            if type(i) is list:
                [v.append(e) for e in i]
            else:
                v.append(i)

让我发疯的是，我在Jupyter Notebook中获得的字典对象（在本文中称为dict1）与dict1完全一样，但是由于某些原因，产生的输出是这样的：

merge_dict = {'Cash': ['USD', 'CAD'], 'Current Liabilities': ['overpayment','loan'],'Debt': ['debt1', 'debt2', 'debt3'], 'Dividends Declared': ['USD', 'CAD'],'Fixed Assets': ['USD', 'CAD']}

我不明白为什么“申明股息”和“固定资产”也附加了元素，尽管它们与dict2的键不同。我得到的dict对象可能有什么问题，使它的行为与dict1不同？

Answer 1

要通过键合并2个字典并累积值：

from collections import defaultdict

dict1 = {'Cash': [], 'Current Liabilities': ['overpayment', 'loan'], 'Debt': ['debt1', 'debt2'],
         'Dividends Declared': [], 'Fixed Assets': []}
dict2 = {'Cash': ['USD', 'CAD'], 'Debt': 'debt3'}

res = defaultdict(list)
for k in set(dict1) | set(dict2):  # Union of dict keys
    v1 = dict1.get(k, [])
    v2 = dict2.get(k, [])
    res[k].extend(v1 if isinstance(v1, list) else [v1])
    res[k].extend(v2 if isinstance(v2, list) else [v2])

print(dict(res))

输出：

{'Cash': ['USD', 'CAD'], 'Fixed Assets': [], 'Current Liabilities': ['overpayment', 'loan'], 'Dividends Declared': [], 'Debt': ['debt1', 'debt2', 'debt3']}

Answer 2

按照您的方法，请找到以下代码：

for k,v in dict1.items():
    for u,i in dict2.items():
        if k==u:
            if type(i) is list:
                dict1[k].extend(i) # list is extending in list value of dict
            else:
                dict1[k].append(i) # elem is appending in list
print(dict1)

Output:
{'Cash': ['USD', 'CAD'], 'Current Liabilities': ['overpayment', 'loan'], 'Debt': ['debt1', 'debt2', 'debt3'], 'Dividends Declared': [], 'Fixed Assets': []}

希望这会有所帮助！

为什么我不能合并这两个词典？

2 个答案: