如何在python中提取多级字典键/值 [英] how to extract multi level dictionary keys/values in python

问题描述

在python中有一个二级字典:

There is a two level dictionary in python:

例如此处:index[term][id] = n
id = 3时如何获取term和n?

for instance here: index[term][id] = n
how to get the term and n when id = 3?

或者如果它以result[id] = [term, n]

推荐答案

迭代嵌套的dict并创建新的dict以所需的格式映射值.您可以创建自定义函数，例如:

Iterate over the nested dict and create new dict to map the values in the desired format. You can create your custom function like:

def get_tuple_from_value(my_dict):
    new_dict = {}
    for term, nested_dict in my_dict.items():
        for id, n in nested_dict.items():
            new_dict[id] = [term, n]
    return new_dict

或者，简单的 dict理解如下所示:

OR, simple dict comprehension will look like:

{i: [t, n] for t, nd in d.items() for i, n in nd.items()}

d存放词典的位置.

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