如何在字典中创建列表而不重复某些键[Python]？

debugcn 发表于 Dev

马修

我想使用id_type_sale和sale_type_description创建一个数组（查看输出中的object_sale_types），保留键email，date，order_id，store，但不要重复（假设它是相同的数据）。

输入值

{
"105": [
    {
        "id_type_sale": 2,
        "email" : null,
        "date" : "2016-05-18",
        "order_id": 105,
        "sale_type_description": "Coffee shop",
        "store": "Ezio store"
    },
    {
        "id_type_sale": 5,
        "order_id": 105,
        "email" : null,
        "date" : "2016-05-18",
        "sale_type_description": "Book shop",
        "store": "Ezio store"
    }
],
"106": [
  {
      "id_type_sale": 3,
      "email" : null,
      "date" : "2016-05-19",
      "order_id": 106,
      "sale_type_description": "Food",
      "store": "Ezio store"
  },
  {
      "id_type_sale": 8,
      "order_id": 106,
      "email" : null,
      "date" : "2016-05-19",
      "sale_type_description": "Articles",
      "store": "Ezio store"
  }]}

预期输出

{
"105":[
    {
        "email":null,
        "date":"2016-05-18",
        "order_id":105,
        "store":"Ezio store",
        "object_sale_types":[
            {
                "id_type_sale":2,
                "sale_type_description":"Coffee shop"
            },
            {
                "id_type_sale":5,
                "sale_type_description":"Book shop"
            }
        ]
    }
],
"106":[
    {
        "email":null,
        "date":"2016-05-19",
        "order_id":106,
        "store":"Ezio store",
        "object_sale_types":[
            {
                "id_type_sale":3,
                "sale_type_description":"Food"
            },
            {
                "id_type_sale":8,
                "sale_type_description":"Articles"
            }
        ]
    }
]}

我能怎么做？有什么更好的方法？我想使用python

缺口

首先，您需要使用加载JSON字符串json.loads，然后可以遍历(key, value)字典中的每一对，value并使用每个对象的公共值和id_sale_typeandsale_type_description值数组构建新的字典。然后，您可以使用来输出新的JSON json.dumps：

d = json.loads(j)
r = {}
for key, value in d.items():
    r[key] = { k : value[0][k] for k in ['email', 'date', 'order_id', 'store'] }
    r[key]['object_sales_types'] = [ { 'id_type_sale' : s['id_type_sale'], 'sale_type_description' : s['sale_type_description'] } for s in value]

print(json.dumps(r, indent=4))

输出：

{
    "105": {
        "email": null,
        "date": "2016-05-18",
        "order_id": 105,
        "store": "Ezio store",
        "object_sales_types": [
            {
                "id_type_sale": 2,
                "sale_type_description": "Coffee shop"
            },
            {
                "id_type_sale": 5,
                "sale_type_description": "Book shop"
            }
        ]
    },
    "106": {
        "email": null,
        "date": "2016-05-19",
        "order_id": 106,
        "store": "Ezio store",
        "object_sales_types": [
            {
                "id_type_sale": 3,
                "sale_type_description": "Food"
            },
            {
                "id_type_sale": 8,
                "sale_type_description": "Articles"
            }
        ]
    }
}

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