Snippet to have abuuider for a imutable object.

imutable_builder.py

class Immutable:
    __slots__ = ()

    def __hash__(self):
        return hash(tuple(getattr(self, v) for v in self.__slots__))

    def __setattr__(self, attr, value):
        raise TypeError('Attributes here are imutable')


class Builder:
    def __init__(self, name, **kwargs):
        self._name = name
        for key, value in kwargs.items():
            setattr(self, key, value)
    def _build(self):
        class_ = type(self._name, (Immutable,), 
                      {'__slots__': [k for k in self.__dict__.keys() if not k.startswith('_')]})
        obj = class_()
        for key, value in self.__dict__.items():
            if key.startswith('_'): continue
            object.__setattr__(obj, key, value)
        return obj