[Python-Dev] PEP 520: Ordered Class Definition Namespace (round 3) (original) (raw)

Émanuel Barry vgr255 at live.ca
Sat Jun 11 23:04:32 EDT 2016

From: Eric Snow Sent: Saturday, June 11, 2016 11:02 PM To: Émanuel Barry Cc: Python-Dev Subject: Re: [Python-Dev] PEP 520: Ordered Class Definition Namespace (round 3)

On Sat, Jun 11, 2016 at 7:51 PM, Émanuel Barry <vgr255 at live.ca> wrote: >> From: Eric Snow >> 1. if _definitionorder_ is defined in the class body then it >> must be a tuple of identifiers or None; any other value >> will result in TypeError > > Why not just any arbitrary iterable, which get converted to a tuple at > runtime? An arbitrary iterable does not necessarily infer a definition order. For example, dict is an iterable but the order is undefined. Also, I'd rather favor simplicity for this (most likely) uncommon corner case of manually setting definitionorder, particularly at the start. If it proves to be a problematic restriction in the future we can loosen it.

Point. This can always be revised later (I'm probably overthinking this as always ;)

-eric

-Emanuel

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