how to extract multi level dictionary keys/values in python

问题

There is a two level dictionary in python:

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

Or it would be perfect if it returns in a form like result[id] = [term, n]

回答1:

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

OR, simple dict comprehension will look like:

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

where d is holding your dictionary.

来源：https://stackoverflow.com/questions/40657403/how-to-extract-multi-level-dictionary-keys-values-in-python