如何在JSON文件中搜索对象，然后更改其中一个密钥对的值？

import json

def search_and_modify(json_data, target_key, new_value):
    if isinstance(json_data, dict):
        for key, value in json_data.items():
            if key == target_key:
                json_data[key] = new_value
            elif isinstance(value, (dict, list)):
                search_and_modify(value, target_key, new_value)
    elif isinstance(json_data, list):
        for item in json_data:
            search_and_modify(item, target_key, new_value)

# 读取JSON文件
with open('data.json', 'r') as file:
    json_str = file.read()

# 解析JSON数据
json_data = json.loads(json_str)

# 搜索对象并更改密钥对的值
search_and_modify(json_data, 'key_to_modify', 'new_value')

# 更新JSON文件
with open('data.json', 'w') as file:
    file.write(json.dumps(json_data, indent=4))