Python键和值中的嵌套Dict [英] Nested Dicts in Python keys and values

问题描述

我收到了一个像这样的字典:

I got a dict of dicts which looks like this:

d {
  1: {
    a: 'aaa',
    b: 'bbb',
    c: 'ccc'
  }
  2: {
    d: 'dddd',
    a: 'abc',
    c: 'cca'
  }
  3: {
    e: 'eee',
    a: 'ababa',
    b: 'bebebe'
  }
}

我想按这样的字典进行转换

I want to convert by dict like this

d {
  a: 1,2,3
  b: 1,3
  c: 1,2
  d: 2
  e: 3
}

我该如何实现?我尝试将其反转，但会抛出无法散列的字典.

How can I achieve this?I tried reversing it but it throws unhashable dict.

推荐答案

a = {
    1: {
        "a": "aaa",
        "b": "bbb",
        "c": "ccc"
    },

    2: {
        "d": "ddd",
        "a": "abc",
        "c": "cca"
    },

    3: {
        "e": "eee",
        "a": "ababa",
        "b": "bebebe"
    }
}

from collections import defaultdict
b = defaultdict(list)
for i, v in a.items():
    for j in v:
        b[j].append(i)

结果b为:

defaultdict(<class 'list'>, {'a': [1, 2, 3], 'b': [1, 3], 'c': [1, 2], 'd': [2], 'e': [3]})

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