models/Base_class.py

from typing import AnyStr

from sqlalchemy.ext.declarative import as_declarative
from sqlalchemy.ext.declarative import declared_attr

@as_declarative()
class Base:
    id:AnyStr
    __name__:str

    # to generate tablename from classname
    # 
    @declared_attr
    def __tablename__(cls) -> str:
        return cls.__name__.lower()