从 python 中的嵌套字典中获取值的最佳方法

Question

Suppose I have a dict:假设我有一个字典：

d = {'A': {'field': 1}, 'B': {'field': 2}}

How can I list the values of all field keys?如何列出所有field键的值？ Expected result:预期结果：

[1, 2]

Answer 1

You can do it in one line simply with list comprehension like so:您可以简单地使用列表理解在一行中完成，如下所示：

fields = [x["field"] for x in d.values() if 'field' in x.keys()]

Hope this helps:)希望这可以帮助：）

Answer 2

[value['field'] for _, value in d.items() if 'field' in value]

Answer 3

Use a list comprehension like this:使用这样的列表推导：

>>> d
{'A': {'field': 1}, 'B': {'field': 2}}
>>> [d[e]['field'] for e in d]
[1, 2]

Answer 4

If you want a clearer readable code than one-liners:如果您想要比单行代码更清晰易读的代码：

d = {'A': {'field': 1}, 'B': {'field': 2}}
fields = d.values()
result = []
for val in fields:
  result.append(val['field'])

print(result)