[Python-Dev] Second post: PEP 557, Data Classes

[Eric V. Smith]

On 11/26/2017 1:04 PM, Brett Cannon wrote:
>     The only open issues I know of are:
>     - Should object comparison require an exact match on the type?
>     https://github.com/ericvsmith/dataclasses/issues/51
> 
> 
> I say don't require the type comparison for duck typing purposes.

The problem with that is that you end up with cases like this, which I 
don't think we want:

@dataclass
class Point:
     x: int
     y: int

@dataclass
class Point3d:
     x: int
     y: int
     z: int

assert Point(1, 2) == Point3d(1, 2, 3)

Eric.