如果“ID”匹配，我試圖更改特定的嵌套值（“pH”），但它只更改第一個而不是我想要的那個。我想做什么：{ "type": "FeatureCollection", "name": "test", "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::3059" } }, "features": [{ "type": "Feature", "properties": { "ID": 1, "pH": 3.5, "P": 2.8, "K": 11.0, "Mg": 15.8 }, "geometry": { "type": "Polygon", "coordinates": [ [ ] ] } }, { "type": "Feature", "properties": { "ID": 2, "pH": 3, "P": 2.5, "K": 11.1, "Mg": 15.8 }, "geometry": { "type": "Polygon", "coordinates": [ [ ] ] } } ]}但它改變了“ID”為 1 的“pH 值”和“ID”：2 的“pH”值保持不變。這是我的代碼：import jsonwith open('filepath', 'r+') as f: data = json.load(f) for feature in data['features']: print(feature['properties']) if feature['properties']["ID"] == 2: data['features'][0]['properties']["pH"]=10 f.seek(0) json.dump(data, f, indent=4) f.truncate()
2 回答
胡說叔叔
TA貢獻1804條經驗 獲得超8個贊
您需要在遍歷時進行枚舉data['features']，以便可以分配回正確的值
data['features'][0]僅分配給ph列表索引 0。
with open('filepath', 'r+') as f:
data = json.load(f)
for i, feature in enumerate(data['features']): # enumerate while iterating
print(feature['properties'])
if feature['properties']["ID"] == 2:
data['features'][i]['properties']["pH"]=10 # assign back to the correct index location
f.seek(0)
json.dump(data, f)
f.truncate()
慕工程0101907
TA貢獻1887條經驗 獲得超5個贊
data['features'][0]
由 [0] 索引，因此修改data["features"]. 您希望它根據評估為True您的條件的索引進行修改feature['properties']["ID"] == 2。
嘗試
for index, feature in enumerate(data['features']):
...
if feature['properties']["ID"] == 2:
data['features'][index]['properties']["pH"] = 10
...
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