import json
import typing
from dataclasses import dataclass
from dataclasses_json import dataclass_json

@dataclass_json
@dataclass
class Msg:
    _from: str
    cmd: str
    values: typing.Any

    def to_json_(self) -> str:
        """将数据类序列化为 JSON 字符串"""
        # return json.dumps(self.__dict__, indent=4, default=lambda x: x.__dict__)
        return self.to_json()

    # @classmethod
    # def from_json(cls, json_str: str) -> 'Msg':
    #     """从 JSON 字符串反序列化为数据类"""
    #     data_dict = json.loads(json_str)
    #     return cls(**data_dict)