如何使用多层迭代JSON？

import json

def iterate_json(data):
    if isinstance(data, dict):
        for key, value in data.items():
            if isinstance(value, dict) or isinstance(value, list):
                iterate_json(value)
            else:
                # 处理数据，例如打印字段值
                print(key, value)
    elif isinstance(data, list):
        for item in data:
            iterate_json(item)

# 示例JSON数据
json_data = '''
{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    },
    "hobbies": ["reading", "swimming"]
}
'''

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

# 迭代JSON数据
iterate_json(parsed_data)