如何检索不包含特定键的JSON的最后一个子级

import json

def find_last_sublevel(json_data, target_key):
    last_sublevel = None

    def traverse(obj):
        nonlocal last_sublevel

        if isinstance(obj, dict):
            if target_key not in obj:
                last_sublevel = obj
            for value in obj.values():
                traverse(value)
        elif isinstance(obj, list):
            for item in obj:
                traverse(item)

    parsed_json = json.loads(json_data)
    traverse(parsed_json)

    return last_sublevel

# 示例JSON数据
json_data = '''
{
  "key1": "value1",
  "key2": "value2",
  "key3": {
    "key4": "value4",
    "key5": "value5"
  },
  "key6": [
    {
      "key7": "value7"
    },
    {
      "key8": "value8"
    }
  ]
}
'''

target_key = "key9"  # 要检查的特定键

result = find_last_sublevel(json_data, target_key)
print(result)