"""第5-4课标准示例：完成Python对象与JSON文本的双向转换。"""

import json


def serialize_book() -> str:
    """把Python图书对象序列化为JSON文本。"""

    book = {
        "id": 1,
        "title": "Python Web基础",
        "price": 59.9,
        "available": True,
        "tags": ["Python", "Web"],
        "description": None,
    }
    return json.dumps(book, ensure_ascii=False, indent=2)


def deserialize_request(request_body: str) -> dict:
    """把客户端发送的JSON文本反序列化为Python字典。"""

    return json.loads(request_body)


def main() -> None:
    """依次展示序列化和反序列化结果。"""

    print("JSON响应：")
    print(serialize_book())
    request_data = deserialize_request('{"title": "HTTP实践", "price": 49.0}')
    print(f"请求中的书名：{request_data['title']}")


if __name__ == "__main__":
    main()