Why is Python's OrderedDict ordered?

addaon 8mo ago ↗

Title of the article is "How…", not "Why…", and "why" is not discussed. (My understanding is that the "why" is "because the implementation acted that way without an official guarantee, and folks depended on the implementation detail, so it became guaranteed.)

recursivecaveat 8mo ago ↗

I was under that impression as well, but it was added as an implementation in 3.6 (https://bugs.python.org/issue27350), so I don't know that too many people would have become dependent on it before it was official in 3.7: https://docs.python.org/3/whatsnew/3.7.html

I think the "how/why" thing is just the automatic title de-clickbait-ifer going a little haywire?

snthpy 8mo ago ↗

Thanks, How makes much more sense. The post title is dumb.

Why is Hackernews news for hackers?

bradchoate 8mo ago ↗

The URL for the post includes "why" (en-why-is-python-ordereddict-ordered), so I suppose the title of the article was updated after the HN post was created. The site's native language is Chinese and I'm guessing the post was translated via automation. In fact, if you run the article through an automated translation service (Google Translate), it reproduces the "Why" title.

more_corn 8mo ago ↗

^ came here to say exactly this

DemocracyFTW2 8mo ago ↗

Wrong title, article has "How Does Python’s OrderedDict Maintain Order?"

Why is Python's OrderedDict ordered? (piglei.com)

6 comments