如何汇总/恢复另一个json对象中的json对象

import json

def extract_nested_json(json_obj):
    nested_json = {}  # 存储提取出的嵌套JSON对象

    for key, value in json_obj.items():
        if isinstance(value, dict):  # 检查值的类型是否为JSON对象
            nested_json[key] = value  # 将嵌套JSON对象添加到新的JSON对象中
            nested_json.update(extract_nested_json(value))  # 递归处理嵌套JSON对象

    return nested_json

# 原始JSON对象
original_json = {
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York",
        "country": "USA"
    },
    "contacts": {
        "email": "john@example.com",
        "phone": "123-456-7890"
    }
}

# 提取嵌套的JSON对象
nested_json = extract_nested_json(original_json)

# 打印提取出的嵌套JSON对象
print(json.dumps(nested_json, indent=4))