How to merge a struct within a struct?

Question

Python

Here is such a structure:

[
  {
    "cat_name":"Распродажа",
    "sub_cats":[
      {
        "cat_name":"aaaaa",
        "goods_inside":[
          "00-00004044",
          "00000000325"
        ]
      },
      {
        "cat_name":"bbbbbb",
        "goods_inside":[
          "00-00001816"
        ]
      }
    ]
  },
  {
    "cat_name":"aaaaa",
    "goods_inside":[
      "00-00003108"
    ]
  },
  {
    "cat_name":"bbbbbb",
    "goods_inside":[
      "00-00001814",
      "00-00004288"
    ]
  }
]

How to get to this one:

[
  {
    "cat_name":"aaaaa",
    "goods_inside":[
      "00-00003108", "00-00004044", "00000000325"
    ]
  },
  {
    "cat_name":"bbbbbb",
    "goods_inside":[
      "00-00001814", "00-00004288",  "00-00001816"
    ]
  }
]

That is, what is in the "Sale" section is thrown into the appropriate subsections, and the "Sale" itself is deleted.
from collections import defaultdict? Or is it better somehow differently?

Answer 1

As an option:

cat_goods_dict = defaultdict(list)

for d in data[0]['sub_cats'] + data[1:]:
    cat_goods_dict[d['cat_name']] += d['goods_inside']

new_data = [
    {'cat_name': cat_val, 'goods_inside': goods_val}
    for cat_val, goods_val in cat_goods_dict.items()
]