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

[Eric V. Smith]

On 11/28/2017 8:31 PM, Eric V. Smith wrote:
> On 11/28/2017 4:14 PM, Guido van Rossum wrote:
>> Hm. Maybe for the ordering comparisons we could defer to the class 
>> with the longest list of fields, as long as there's a subtype 
>> relationship? That way b<c and c>b would be equivalent, and both would 
>> use C.__gt__. Which had better not reject this on the basis that other 
>> is not an instance of a subclass of C.
>>
>> IIRC there's already something in the interpreter that tries the most 
>> derived class first for binary operators -- that may force our hand here.
> 
> I'm leaning toward doing the same thing attrs does. They have much more 
> experience with this.

Except that given Hynek's response in 
https://github.com/ericvsmith/dataclasses/issues/51#issuecomment-347769322, 
I'm just going to leave it as-is, with a strict type requirement for all 
6 methods.

Eric.