[Python-Dev] Guarantee ordered dict literals in v3.7? (original) (raw)
Guido van Rossum guido at python.org
Fri Dec 22 19:12:31 EST 2017
- Previous message (by thread): [Python-Dev] Guarantee ordered dict literals in v3.7?
- Next message (by thread): [Python-Dev] Guarantee ordered dict literals in v3.7?
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Let's not change pprint.
On Fri, Dec 22, 2017 at 7:44 AM, Eric Fahlgren <ericfahlgren at gmail.com> wrote:
On Thu, Dec 21, 2017 at 7:51 PM, Stephen J. Turnbull <_ _turnbull.stephen.fw at u.tsukuba.ac.jp> wrote:
I understand the motivation to guarantee order, but it's a programmer convenience that has nothing to do with the idea of mapping, and the particular (insertion) order is very special and usually neither relevant nor reproducible. I have no problem whatsoever with just documenting any failure to preserve order while reproducing dicts, except that a process that inserts keys in the same order had better result in the same insertion order.
json, pickle == png, i.e., guaranteed lossless. repr, pprint == jpg, lossy for very specific motivating reasons. In particular, I use pprint output in regression baselines, and if the long documented sort-by-key behavior changed, I would not be happy.
Python-Dev mailing list Python-Dev at python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/ guido%40python.org
-- --Guido van Rossum (python.org/~guido) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20171222/2ce49d31/attachment.html>
- Previous message (by thread): [Python-Dev] Guarantee ordered dict literals in v3.7?
- Next message (by thread): [Python-Dev] Guarantee ordered dict literals in v3.7?
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]