[Python-Dev] Second post: PEP 557, Data Classes (original) (raw)

Eric V. Smith eric at trueblade.com
Tue Nov 28 20:31:36 EST 2017

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 bb 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.

This is my last open specification issue. I think I'm ready for a pronouncement on the PEP once I do one final editing pass, in hopes of getting this in 3.7.0a3 by next weekend. If the comparisons need to change, I'm okay with doing that in the beta.

Eric.

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