如何获取JSON中字段的最后一个条目

import json

def get_last_item(json_str, target_field):
    json_obj = json.loads(json_str)
    last_item = None
    last_index = -1

    def process_obj(obj, index):
        nonlocal last_item
        nonlocal last_index

        for key, value in obj.items():
            if key == target_field:
                last_item = value
                last_index = index
            elif isinstance(value, list):
                process_array(value, index)
            elif isinstance(value, dict):
                process_obj(value, index)

    def process_array(arr, index):
        nonlocal last_item
        nonlocal last_index

        for item in arr:
            if isinstance(item, dict):
                process_obj(item, index + 1)
            elif isinstance(item, list):
                process_array(item, index)

    if isinstance(json_obj, dict):
        process_obj(json_obj, 0)
    elif isinstance(json_obj, list):
        process_array(json_obj, 0)

    return last_item, last_index

# 示例 JSON 字符串
json_string = '''
{
  "data": {
    "name": "John",
    "age": 30,
    "scores": [85, 90, 95],
    "address": {
      "city": "New York",
      "state": "NY"
    }
  }
}
'''

target_field = "scores"
last_item, last_index = get_last_item(json_string, target_field)

print("Last item in {} is {} at index {}".format(target_field, last_item, last_index))