python如何快速的判断一个key在json的第几层呢，并修改其value值

def find_and_modify_key(json_obj, target_key, new_value, current_level=1):# 检查当前层是否包含目标keyif target_key in json_obj:print(f"找到 '{target_key}' 在第 {current_level} 层。")# 修改key的值json_obj[target_key] = new_valuereturn current_level, json_objelse:# 否则，递归地搜索嵌套的字典for key, value in json_obj.items():if isinstance(value, dict):level, modified_obj = find_and_modify_key(value, target_key, new_value, current_level + 1)if level is not None:  # 如果找到了key# 因为已经找到并修改了key，可以中断进一步的搜索return level, modified_obj# 如果当前层及其子层都没有找到key，返回Nonereturn None, json_obj# 示例JSON对象
json_data = {"level1": {"level2": {"key_to_find": "old_value","another_key": "value"},"level2_2": {"key_to_find": "another_old_value"}},"single_level": "data"
}# 要查找和修改的key及其新值
target_key = "key_to_find"
new_value = "new_value"# 查找并修改key
level, modified_json = find_and_modify_key(json_data, target_key, new_value)if level is not None:print(f"修改后的JSON数据：{modified_json}")
else:print(f"在JSON数据中未找到 '{target_key}'。")