On 18 December 2017 at 20:38, Nick Coghlan <[email protected]> wrote:
> > On 19 Dec. 2017 7:00 am, "Chris Barker" <[email protected]> wrote: > > > Are there other options?? > > plain old: > > @dataclass > class C: > a = 1 > b = 1.0 > > would work, though then there would be no way to express fields without > defaults: > > > The PEP already supports using "a = field(); b = field()" (etc) to declare > untyped fields without a default value. > > The PEP is not 100% clear not this, but it is currently not the case and this may be intentional (one obvious way to do it), I just tried and this does not work: @dataclass class C: x = field() generates `__init__` etc. with no arguments. I think however that it is better to generate an error than silently ignore it. (Or if this a bug in the implementation, it should be just fixed.) -- Ivan
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