[Python-Dev] PEP 520: Ordered Class Definition Namespace (original) (raw)

Ethan Furman ethan at stoneleaf.us
Thu Jun 9 18:11:50 EDT 2016

On 06/09/2016 02:39 PM, Nick Coghlan wrote:

On 7 June 2016 at 20:17, Eric Snow wrote:

On Tue, Jun 7, 2016 at 6:20 PM, Ethan Furman wrote:

If definitionorder is supposed to be immutable as well as read-only then we should convert non-tuples to tuples. No point in letting that user bug slip through.

Do you mean if a class explicitly defines definitionorder? If so, I'm not clear on how that would work. It could be set to anything, including None or a value that does not iterate into a definition order. If someone explicitly set definitionorder then I think it should be used as-is. I'm guessing Ethan is suggesting defining it as: definitionorder = tuple(ns["definitionorder"]) When the attribute is present in the method body.

Yup, that it's it exactly. Thanks, Nick!

-- Ethan

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