throwaway2037 10 months ago

You can use:

    > @dataclass(frozen=True)

to create an immutable data class.

▲ maleldil 10 months ago | parent [-]

While that works (and I use it extensively), it's a bit hacky. You have to use `object.__setattr__` to set attributes in `__init__` or `__post_init__`, which looks so wrong.

	▲	maxbond 10 months ago \| parent \| next [-]
		I think the cleaner alternative would be to use a static or class method as an alternative constructor and use the init the dataclass decorator provides for you. Eg something like: `@dataclass(frozen=True) class Foo: bar: int baz: str @classmethod def new(cls, bar: int) -> "Foo": baz = calculate_baz(bar) return cls(bar, baz) foo = Foo.new(10)`
	▲	throwaway2037 10 months ago \| parent \| prev [-]
		What is wrong with a static factory method?