TypeError: string must be indices on JSON looping through feature array of objects in arcpy

Question

我试图遍历我的 json 并且只获取对象的特征数组并获取所有对象，但我似乎无法理解我的 python 代码哪里做错了.这是我的代码：

我查看了这些问题以寻求建议，但似乎没有用。

jsonData = operationalLayers = None
#for testing purposes, parse from a json file
if Web_Map_as_JSON != '':
    jsonData = json.loads(Web_Map_as_JSON)
    operationalLayers = jsonData["operationalLayers"]
    arcpy.AddMessage("We have valid json data")
else:
    with open('json/WLA-FRI-AY-14-subset.json') as data:
        jsonData = json.load(data)
        operationalLayers = jsonData["operationalLayers"]
    print "We parsed json data from a file"

# looping thru only graphics-operation-layer and its sub layers
# and add attributes for each features on the layout
for ol in operationalLayers:
    #hard code the first feature layer
    if (ol["id"] == "ParcelRouteEditingTest_1259"):
        if (ol.has_key('featureCollection')):
            fcol = ol["featureCollection"]
            if (not fcol.has_key('layers')):
                continue
            lyrs = fcol["layers"]

            #loop through layer
            for i in lyrs:
                # feature set data on the graphic layer
                fs = i["featureSet"]
                # store attributes for easy access
                for featureData in fs:
                   featureDataObj = featureData[1]["features"]
                    print featureDataObj
                # queryURL = '{0}/query'.format(i['url'])
                # arcpy.AddMessage(queryURL)
                # getQuery = requests.get(queryURL)
                # if(getQuery.status_code == 200):
                #     fs = getQuery.json()
                    updateLayoutElementWithFeatureAttributes(feature_data_obj, None, pdfPaths)

这是 json 数据的结构：

错误：

Traceback (most recent call last):
  File "C:\Workspace-TT\pythonprint\customPrint.py", line 299, in <module>
    featureDataObj = featureData[1]["features"]
TypeError: string indices must be integers

Answer 1

featureSet 不是一个列表，它是一个以 geometryType 和 features 为键的字典。

当你这样做时

for featureData in fs:

您正在遍历这些键。

如果您的意思是遍历 features 下的列表，您应该执行类似

的操作

featureset['features'][i]

或

for feature in featureSet['features']