Currently I have something like this:

@dataclass(frozen=True)
class MyClass:a: strb: strc: strd: Dict[str, str]

...which is all well and good except dicts are mutable, so I can't use my class to key another dictionary.

Instead, I'd like field d to be something like a FrozenSet[Tuple[str, str]], but I'd still like someone constructing an instance of my class to be able to pass a dictionary on the constructor as this is much more intuitive.

So I'd like to do something like

@dataclass(frozen=True)
class MyClass:a: strb: strc: strd: FrozenSet[Tuple[str, str]] = field(init=False)def __init__(self, a, b, c, d: Dict[str, str]):self.original_generated_init(a, b, c)  # ???object.setattr(self, 'd', frozenset(d.items()))  # required because my dataclass is frozen

How do I achieve this? Alternatively is there a more elegant way to achieve the same thing?

You can use an InitVar and assign to d in __post_init__:

@dataclass(frozen=True)
class MyClass:a: strb: strc: strd: FrozenSet[Tuple[str, str]] = field(init=False)d_init: InitVar[Dict[str, str]]def __post_init__(self, d_init):object.__setattr__(self, 'd', frozenset(d_init.items()))