Question

我有一个以下格式的json：

{
  "features": [{
      "geometry": {
        "coordinates": [
          [
            [-12.345, 26.006],
            [-78.56, 24.944],
            [-76.44, 24.99],
            [-76.456, 26.567],
            [-78.345, 26.23456]
          ]
        ],

        "type": "Polygon"
      },

      "id": "Some_ID_01",

      "properties": {
        "parameters": "elevation"
      },
      "type": "Feature"
    },

    {
      "geometry": {
        "coordinates": [
          [
            [139.345, 39.2345],
            [139.23456, 37.3465],
            [141.678, 37.7896],
            [141.2345, 39.6543],
            [139.7856, 39.2345]
          ]
        ],
        "type": "Polygon"
      },
      "id": "Some_OtherID_01",
      "properties": {
        "parameters": "elevation"
      },
      "type": "Feature"
    }, {
      "geometry": {
        "coordinates": [
          [
            [143.8796, -30.243],
            [143.456, -32.764],
            [145.3452, -32.76],
            [145.134, -30.87],
            [143.123, -30.765]
          ]
        ],
        "type": "Polygon"
      },
      "id": "Some_ID_02",
      "properties": {
        "parameters": "elevation"
      },
      "type": "Feature"
    }
  ],
  "type": "FeatureCollection"
}

我试图根据id字段删除任何重复/旧版本的json对象（即id=Some_ID_01和id=Some_ID_02的对象被视为重复项目。）

到目前为止，我已经设法将json解析为python并创建一个需要删除的所有ID的列表。我实际上使用该列表来删除/弹出我解析的json中的对象，因此我可以将结果重写为新的json文件，更不用说它远未优化（我的json文件中有大约20k个对象））

到目前为止，这是我的python代码：

import json

json_file = open('features.json')
json_str = json_file.read()
json_data = json.loads(json_str)

dictionaryOfJsonId = {}
removalCounter = 0
keyToRemove = []
valueToRemoveFromList = []
IDList = []
removedSometing = 0

for values in json_data['features']:    #This loop converts the values in the json parse into a dict of only ID
    stringToSplit = values["id"]        #the id values from the json file
    IDList.append(stringToSplit)        #list with all the ID
    newKey = stringToSplit[:-2]         #takes the initial substring up to the last 2 spaces (version)
    newValue = stringToSplit[-2:]       #grabs the last two characters of the string

    if newKey in dictionaryOfJsonId:
        dictionaryOfJsonId[newKey].append(newValue)
    else:
        dictionaryOfJsonId[newKey] = [newValue]


for key in dictionaryOfJsonId:          #Remove entries that do not have duplicates
    if len(dictionaryOfJsonId[key])<2:
        valueToRemoveFromList.append(str(key + dictionaryOfJsonId[key][0]))
    else:
        valueToRemoveFromList.append(str(key +max(dictionaryOfJsonId[key])))


for string in valueToRemoveFromList:    #Remove all values that don't have duplicates from the List of ID
    IDList.remove(string)
    removalCounter+=1


for i in json_data['features']:
    for x in IDList:
        if i['id'] == x:
            json_data.pop(i)

最后一个for循环是我最近尝试删除的，但是我得到了错误：

TypeError：不可用类型：'dict'

Answer 1

您收到错误是因为pop需要索引，而不是对象。

然而，自it's a bad idea to modify a list that you're iterating over以来，这有点无关紧要。

我考虑使用列表理解;像good_features = [i for i in json_data['feature'] if i['id'] not in IDList]

这样的东西

使用从Python中的字符串列表中获取的密钥从JSON文件中删除对象

1 个答案: