dataclasses_.py

from dataclasses import dataclass, field, asdict


@dataclass
class Schedule:
    id: int
    name: str

@dataclass
class Company:
    id: int
    name: str
    enabled: bool = True
    schedule: Schedule = field(default_factory=Schedule)

@dataclass
class User:
    id: int
    name: str
    company: Company = field(default_factory=Company)

if __name__ == '__main__':
    schedule = Schedule(id=1, name='Work Schedule')
    company = Company(id=1, name='Google', schedule=schedule)
    user = User(id=1, name='John', company=company)

    print(user.company.schedule.id)

    user2 = User(**asdict(user))
    print(user2.company.schedule.id)