code-generation-example.py

import attr, marshmallow, typing


@attr.s(auto_attribs=True, init=False, repr=False)
class Price:
    id: typing.Optional[str]
        
    def __init__(self, *, id: typing.Optional[str] = None) -> None:
        self.id = id
        
    def __repr__(self) -> str:
        return "Price(id=%r)" % (self.id)


class PriceSchema(marshmallow.Schema):
    id = marshmallow.fields.String(allow_none=True, missing=None)
    
    class Meta:
        unknown = marshmallow.EXCLUDE
        
    @marshmallow.post_load
    def post_load(self, data):
        return types.Price(**data)