在python中使用dict键作为不同的dict中的值 [英] Using dict keys in python as values in a different dict

问题描述

我想创建一个翻译类型的dict，它将为我创建的一个dict中的密钥分配属于嵌套的不同分组中的键的值。我遇到的问题是，我不能创建一个代表嵌套的dict键的值，而不必将其转换为字符串或其他数据类型，当我尝试使用字符串作为嵌套dict的索引时，我得到一个索引错误。理想情况下，我的dict将如下所示：

I would like to create a "translator" type of dict that would assign values that are keys in different dicts, which are nested, to keys in a dict that I created. The problem I run into is that I can't create a value that represents a nested dict key without having to convert that to a string or some other data type, and when I try to use a string as an index to the nested dict, I get an index error. Ideally, my dict would look something like this:

new_dict{
    "new_key_1" : ['subdict1']['subdict2']['old_key_1'],
    "new_key_2" : ['subdict1']['subdict2']['old_key_2'],
    "new_key_3" : ['subdict1']['subdict3']['old_key_3']
    }

然后，对于每个嵌套的dict，我可以用简单的for循环生成一个新的dict对象：

Then, for each nested dict, I could generate a new dict object with a simple for loop:

for key, value in new_dict.items() :
    user_dict_1[key] = OldDict[value]

嵌套的dicts非常大，我只需要几个每个字段，否则我可以使用.copy（）函数来处理旧的dict。

The nested dicts are very large and I only need a few fields from each, otherwise I could just use the .copy() function to work with the old dicts.

PS-任何帮助重写这个问题，更可读

PS- Any help in rewriting this question to be more readable also appreciated.

推荐答案

您将需要 reduce（）这一个...

You're going to need reduce() for this one...

attrmap = {
  "new_key_1": ('subdict1', 'subdict2', 'old_key_1'),
   ...
}

print reduce(lambda x, y: x[y], attrmap[somekey], old_object)

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