当key已知但确切位置未知时，从嵌套的Json中提取特定值

import json

def extract_value_from_json(json_data, target_key):
    # 解析Json数据
    data = json.loads(json_data)

    # 遍历Json数据
    def traverse(data, target_key):
        if isinstance(data, dict):  # 处理字典类型
            for key, value in data.items():
                if key == target_key:
                    # 找到目标值
                    print(value)
                else:
                    traverse(value, target_key)
        elif isinstance(data, list):  # 处理数组类型
            for item in data:
                traverse(item, target_key)
    
    # 提取特定值
    traverse(data, target_key)

json_data = '''
{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York",
        "country": "USA"
    }
}
'''

target_key = "name"
extract_value_from_json(json_data, target_key)