Сравнение двух способов создание классов с данными

attrs.py

import uuid
import datetime
import json
from typing import Callable, Dict, Iterable, List, Tuple
import attr
from pprint import pprint

@attr.s
class File:
    hash = attr.ib(default=attr.Factory(dict))
    mime = attr.ib(default=attr.Factory(dict))
    name = attr.ib(default=attr.Factory(str))
    path = attr.ib(default=attr.Factory(dict))
    size = attr.ib(default=attr.Factory(int))
    storage = attr.ib(default=attr.Factory(dict))
    user = attr.ib(default=attr.Factory(dict))
    updated_at = attr.ib(default=datetime.datetime.now())
    created_at = attr.ib(default=datetime.datetime.now())

@attr.s
class Payload:
    file = attr.ib(default=attr.Factory(File))
    mime = attr.ib(default=attr.Factory(dict))
    storage = attr.ib(default=attr.Factory(dict))

@attr.s
class Message(object):
    # service = attr.ib(validator=attr.validators.instance_of(str))
    uuid = attr.ib(default=uuid.uuid4())
    timestamp = attr.ib(default=datetime.datetime.now())
    status = attr.ib(default={'success': True})
    source = attr.ib(default=attr.Factory(dict))
    payload = attr.ib(default=attr.Factory(Payload))



item = Message(payload=Payload())
d = attr.asdict(item)
pprint(d)



# x = json.dumps(d, indent=4, sort_keys=True, default=str)
# pprint(x)

dataclass.py

import uuid
import datetime
import json
from typing import Callable, Dict, Iterable, List, Tuple
from dataclasses import dataclass, asdict, field
from pprint import pprint

@dataclass
class File:
    hash: str = ''
    mime: str = ''
    name: str = ''
    path: str = ''
    size: int = 0
    storage: str = ''
    user: str = ''
    updated_at: int = datetime.datetime.now()
    created_at: int = datetime.datetime.now()

@dataclass
class Payload:
    file: File = field(default_factory=dict)

@dataclass
class Message:
    uuid: str = uuid.uuid4()
    service: str = ''
    timestamp: int = datetime.datetime.now().timestamp()
    status: dict = None
    source: str = None
    payload: Payload = field(default_factory=dict)

    def __post_init__(self):
            self.status = {'success': True}

@dataclass
class InputMessage(Message):
    pass

item = InputMessage()
item.payload = Payload(File())
d = asdict(item)
pprint(d