[Python-Dev] Concerns about method overriding and subclassing with dataclasses

Ethan Smith ethan at ethanhs.me
Fri Dec 29 19:35:32 EST 2017


On Fri, Dec 29, 2017 at 12:30 PM, Ethan Furman <ethan at stoneleaf.us> wrote:

> On 12/29/2017 11:55 AM, Ethan Smith wrote:
>
>> On Fri, Dec 29, 2017 at 11:37 AM, Ethan Furman wrote:
>>
>
> It is possible to determine whether an existing __repr__ is from 'object'
>>>
>> >> or not, and only provide one if that is the case.  I think that should
> be
> >> the default, with 'repr = True' for those cases where a new,
> auto-generated,
>
>> __repr__ is desired.
>>>
>>
>> The only other thing you'd want to handle is to cover inheriting from
>> another dataclass. e.g., if I have dataclass with
>> attribute a, and subclass it to add attribute b, I'd want both in the
>> repr.
>>
>
> Good point.  So auto-generate a new __repr__ if:
>
> - one is not provided, and
> - existing __repr__ is either:
>   - object.__repr__, or
>   - a previous dataclass __repr__
>
> And if the auto default doesn't work for one's use-case, use the keyword
> parameter to specify what you want.
>
>
> --
> ~Ethan~
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