Python 比较两个字典中的键并使用for循环更新值

具有点要素的GeoJson包含两个属性：城市和评级。 城市作为标识从未改变，但评级将定期更新。 新评级作为vales（“dnew”）存储在字典中。 我的for循环工作不正常。请参阅下面的代码，其中“#问题在这里”标记了我无法解决的问题

import json

dnew = {"Budapest": "fair", "New York": "very good", "Rome": "awesome"}

data = {
"type": "FeatureCollection",
"name": "Cities",
"crs": { "type": "name", "properties": { "name":     "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { "City": "New York", "Rating": "good" },     "geometry": { "type": "Point", "coordinates": [ -73.991836734693834,     40.736734693877537 ] } },
{ "type": "Feature", "properties": { "City": "Rome", "Rating": "fair" }, "geometry": { "type": "Point", "coordinates": [ 12.494557823129199, 41.903401360544223 ] } },
{ "type": "Feature", "properties": { "City": "Budapest", "Rating": "awesome" }, "geometry": { "type": "Point", "coordinates": [ 19.091836734693832, 47.494557823129256 ] } }
]
}

#at this point, keys of two dictionaies are compared. If they are the same, the value of the old dict is updated/replaced by the value of the new dict
for key in data["features"]:
    citykey = (key["properties"]["City"])
    ratingvalue = (key["properties"]["Rating"])
    #print(citykey + "| " + ratingvalue)

    for keynew in dnew:
        citynew = (keynew)
        ratingnew = dnew[keynew]
        #print(citynew + " | " + ratingnew)
        print(citykey + "==" + citynew)

        if citykey == citynew:
            #
            #here is the problem
            #
            data["features"]["properties"]["Rating"] = ratingnew
            print(True)
        else:
            print(False)

错误消息：

TypeError: list indices must be integers or slices, not str

---

谢谢大家!

由于它是一个列表而不是一个字典，所以它遗漏了“features”后面的数字索引

---

data[“features”][0][“properties”][“Rating”]

对于

data[“features”]

列表中的每个元素，在

dnew

字典中循环所有键，这样就失去了字典的好处

E.Coms注意到您遇到的问题，但只检查列表中的第一项（

数据[“功能”][0]

）

也许以下几点可以解决你的问题

for key in data["features"]:
    citykey = (key["properties"]["City"])
    ratingvalue = (key["properties"]["Rating"])
    #print(citykey + "| " + ratingvalue)

    if citykey in dnew:
        key["properties"]["Rating"] = dnew[citykey]