And typing JSON-like data is possible with TypedDict[1].
[0] https://docs.python.org/3/library/dataclasses.html
[1] https://docs.python.org/3/library/typing.html#typing.TypedDi...
How old is your Python, though? TypedDict is from 3.8. That was 5 years ago.
> @dataclass(frozen=True)
@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)To me, namedtuples are a convenience to give a nicer syntax than ordinary tuples in scenarios where I don't want the overhead of having to store a copy of all the keys with every object, like a dict would. Dataclass seems to be even more stuff on top of a class which is effectively even more stuff on top of a dict, but all the use cases of namedtuples are those where you want much less stuff than an ordinary class has. And I don't want to have to define a custom class just as I often don't define a custom namedtuple in my code but use the one the database driver generates based on the query, which is a very common use case for namedtuples as efficient temporary storage of data that then gets processed to something else.