Question

对于名为data的geojson类型文件，如下所示：

{
    "type": "FeatureCollection",
    "name": "entities",
    "features": [{
            "type": "Feature",
            "properties": {
                "Layer": "0",
                "SubClasses": "AcDbEntity:AcDbPolyline",
                "EntityHandle": "1A0"
            },
            "geometry": {
                "type": "LineString",
                "coordinates": [
                    [3220.136443006845184, 3001.530372177397112],
                    [3847.34171007254281, 3000.86074447018018],
                    [3847.34171007254281, 2785.240077064262096],
                    [3260.34191304818205, 2785.240077064262096],
                    [3260.34191304818205, 2795.954148466309107]
                ]
            }
        },
        {
            "type": "Feature",
            "properties": {
                "Layer": "0",
                "SubClasses": "AcDbEntity:AcDbPolyline",
                "EntityHandle": "1A4"
            },
            "geometry": {
                "type": "LineString",
                "coordinates": [
                    [3611.469650131302842, 2846.845982610575902],
                    [3695.231030111376185, 2846.845982610575902],
                    [3695.231030111376185, 2785.240077064262096],
                    [3611.469650131302842, 2785.240077064262096],
                    [3611.469650131302842, 2846.845982610575902]
                ]
            }
        }
    ]
}

我希望对data进行以下操作：

用EntityHandle替换密钥Name;
用EntityHandle等将十六进制数中的'sf_001', 'sf_002', 'sf_003'的值替换为；
用type代替LineString的值Polygon;
用三个方括号替换coordinates的两个方括号。

这是预期的输出：

{
    "type": "FeatureCollection",
    "name": "entities",
    "features": [{
            "type": "Feature",
            "properties": {
                "Layer": "0",
                "SubClasses": "AcDbEntity:AcDbPolyline",
                "Name": "sf_001"
            },
            "geometry": {
                "type": "Polygon",
                "coordinates": [ [
                    [3220.136443006845184, 3001.530372177397112],
                    [3847.34171007254281, 3000.86074447018018],
                    [3847.34171007254281, 2785.240077064262096],
                    [3260.34191304818205, 2785.240077064262096],
                    [3260.34191304818205, 2795.954148466309107]
                ] ]
            }
        },
        {
            "type": "Feature",
            "properties": {
                "Layer": "0",
                "SubClasses": "AcDbEntity:AcDbPolyline",
                "Name": "sf_002"
            },
            "geometry": {
                "type": "Polygon",
                "coordinates": [ [
                    [3611.469650131302842, 2846.845982610575902],
                    [3695.231030111376185, 2846.845982610575902],
                    [3695.231030111376185, 2785.240077064262096],
                    [3611.469650131302842, 2785.240077064262096],
                    [3611.469650131302842, 2846.845982610575902]
                ] ]
            }
        }
    ]
}

我是使用Python处理JSON文件的新手。请帮助我，谢谢。

import json
from pprint import pprint

with open('data.geojson') as f:
    data = json.load(f)

pprint(data)

for feature in data['features']:
    #print(feature)
    print(feature['properties']['EntityHandle'])

for feature in data['features']: 
    feature['properties']['EntityHandle'] = feature['properties']['Name'] #Rename `EntityHandle` to `Name`
    del feature['properties']['EntityHandle']

结果：

Traceback (most recent call last):

  File "<ipython-input-79-8b30b71fedf9>", line 2, in <module>
    feature['properties']['EntityHandle'] = feature['properties']['Name']

KeyError: 'Name'

Answer 1

试一下：

您可以使用以下方法重命名密钥：

dict['NewKey'] = dict.pop('OldKey')

要替换一个值，就像将新值设置为等于特定键一样简单：

dict['Key'] = new_value

完整代码：

data =  {
    "type": "FeatureCollection",
    "name": "entities",
    "features": [{
            "type": "Feature",
            "properties": {
                "Layer": "0",
                "SubClasses": "AcDbEntity:AcDbPolyline",
                "EntityHandle": "1A0"
            },
            "geometry": {
                "type": "LineString",
                "coordinates": [
                    [3220.136443006845184, 3001.530372177397112],
                    [3847.34171007254281, 3000.86074447018018],
                    [3847.34171007254281, 2785.240077064262096],
                    [3260.34191304818205, 2785.240077064262096],
                    [3260.34191304818205, 2795.954148466309107]
                ]
            }
        },
        {
            "type": "Feature",
            "properties": {
                "Layer": "0",
                "SubClasses": "AcDbEntity:AcDbPolyline",
                "EntityHandle": "1A4"
            },
            "geometry": {
                "type": "LineString",
                "coordinates": [
                    [3611.469650131302842, 2846.845982610575902],
                    [3695.231030111376185, 2846.845982610575902],
                    [3695.231030111376185, 2785.240077064262096],
                    [3611.469650131302842, 2785.240077064262096],
                    [3611.469650131302842, 2846.845982610575902]
                ]
            }
        }
    ]
}



sf_count = 0
for feature in data['features']: 
    feature['properties']['Name'] = feature['properties'].pop('EntityHandle') #Rename `EntityHandle` to `Name`

    sf_count += 1
    feature['properties']['Name'] = 'sf_%.3d' %sf_count # Replace hex with incrimental sf_xxx

    feature['geometry']['type'] = 'Polygon' # Replace `LineString` to `Polygon`

    feature['geometry']['coordinates'] = [[ each for each in feature['geometry']['coordinates'] ]]

在Python中替换JSON文件的多个键和值

1 个答案: