在递归函数中添加一个条件，以读出嵌套json文件中的特定键及其值

import json

def read_json(json_data, target_key):
    result = {}  # 保存目标键及其值的字典

    def recursive_search(data, key):
        if isinstance(data, dict):  # 判断值是否为字典
            for k, v in data.items():
                if k == key:  # 判断当前键是否是目标键
                    result[k] = v
                else:
                    recursive_search(v, key)  # 递归处理字典中的值
        elif isinstance(data, list):  # 判断值是否为列表
            for item in data:
                recursive_search(item, key)  # 递归处理列表中的元素

    recursive_search(json_data, target_key)
    return result

# 示例JSON数据
json_data = {
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 ABC Street",
        "city": "New York",
        "country": "USA"
    },
    "friends": [
        {
            "name": "Alice",
            "age": 25
        },
        {
            "name": "Bob",
            "age": 35
        }
    ]
}

target_key = "city"
result = read_json(json_data, target_key)
print(result)