bah, I forgot the underscore in the setter. Corrected for clarity:
@dataclasses.dataclass(frozen=True)
class Person:
name: str
surname: str
fullname: str = dataclasses.field(property=True) # fullname is now a
field descriptor
@fullname.getter
def fullname_getter(self):
return self._fullname
@fullname.setter
def fullname_setter(self, value):
assert value == ????
self._fullname = f"{self.name} {self.surname}"
---
Ricky.
"I've never met a Kentucky man who wasn't either thinking about going home
or actually going home." - Happy Chandler
On Wed, Dec 11, 2019 at 6:08 PM Ricky Teachey <ri...@teachey.org> wrote:
>
>
>> I agree with Andrew: it's a great idea, but I couldn't come up with a
>> way to implement it, so I followed attrs lead instead. Maybe someone can
>> come up with a good way to implement it
>
>
> It seems like this could be solved if a general way could be created to
> allow dataclasses to handle descriptors properly? Or if not descriptors
> proper, at least a dataclass version of @property?
>
> I'm sure this has been discussed before. But one idea would be to add an
> optional "property" argument to `field`, which would turn it into a
> descriptor.
>
> So the code could be something like this, maybe:
>
> @dataclasses.dataclass(frozen=True)
> class Person:
> name: str
> surname: str
> fullname: str = dataclasses.field(property=True) # fullname is now a
> field descriptor
>
> @fullname.getter
> def fullname_getter(self):
> return self._fullname
>
> @fullname.setter
> def fullname_setter(self, value):
> assert value == ????
> self.fullname = f"{self.name} {self.surname}"
>
> If this is a good idea, one big question is what the default __init__
> method should supply to the "value" argument.
>
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