from typing import Any, Dict
from dataclass_marshal import dataclass, marshal, unmarshal

@dataclass
class Product:
    id: int
    attributes: Dict[str, Any]


product = Product(1, {'weight': 10})

marshalled = marshal(product)
# {'id': 1, 'attributes': {'weight': 10}}
unmarshalled = unmarshal(marshalled, Product)
# Product(id=1, attributes={'weight': 10})

from dataclass_marshal import register, marshal

class Dimensions:
    def __init__(self, height, width, depth):
        self.height = height
        self.width = width
        self.depth = depth


register(Dimensions, marshaller=lambda x: x.__dict__, unmarshaller=lambda x: Dimensions(**x))
marshalled = marshal(Dimensions(1,2,4))
# {'height': 1, 'width': 2, 'depth': 4}