On 2/17/2018 2:35 PM, Guido van Rossum wrote:
PS. I have to ponder why frozen dataclasses don't use `__new__`.
As I'm sure everyone is now aware after the rest of this discussion: it's because the returned object isn't really immutable.
That said, I have threatened to create a decorator similar to typing.NamedTuple that has the @dataclass features (except maybe __post_init__) and returns a class that does inherit from tuple, in which case it really would use `__new__`. I'll save that for 3.8, if it ever happens. There's a lot there to think about, first. For now, typing.NamedTuple is the way to go if you want something based on namedtuple yet using type hints.
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