import dataclasses import datetime __all__ = ['MYSELF', 'Message'] MYSELF = 'MYSELF' @dataclasses.dataclass(frozen=True, order=True) class Message: sent_at: datetime.datetime sender: str text: str chat_id: str def __post_init__(self): assert self.sent_at is not None assert self.sender is not None assert self.text is not None assert self.chat_id is not None