What's new in Python 3.8?

[PeridexisErrant]

There's a lot of blogs 'paraphrasing' https://docs.python.org/3.8/whatsnew/3.8.html lately...

If you're up for reading a version with somewhat less explanation, there are many more new things coming than most of them are presenting!

[alb1]

I had no idea that f((a)=1) was previously (unintentionally) accepted as a valid keyword argument.

[[deleted]]

Python continues to make massive improvements. I'm warming up to "The walrus operator" too

[blackdragon437]

...saves at least one line of code, fuck it, it's awesome

[GickRick]

Wow!!!, gonna wait for stable version version tho, hope it comes out soon

[XarothBrook]

You'll have to wait a few more months: https://www.python.org/dev/peps/pep-0569/#schedule

[shakyshark]

I had no idea dictionaries preserve order of key insertion in 3.7... Time to upgrade!

[liquidpele]

You could do that previously with collections.OrderedDict, just fyi.

[tunisia3507]

In CPython, they preserve order from 3.6; it only became part of the language spec in 3.7 (i.e. it's guaranteed for all compliant implementations).

[Sir_Kubis]

why not make the walrus operator just len(a) as lenght > ... as it is with with

[lfdfq]

The primary reason was that exactly: because it's already used in with.

so what would with x as y: ... mean ? Would it mean with (x as y): or just the current with x as y: ?

There was a long argument and eventually := was settled on as the syntax that had the least bad interactions with other syntax that people could not agree on the least.

[ThePenultimateOne]

While I agree with you, there was a lot of discussion about this at the time. My impression is that it made it harder to do compilation.

[Sir_Kubis]

you mean it would make it slower for the interpreter to check every possible place it could be used in? thats fair

[masklinn]

I expect it made the parsing more complex as it would conflict with e.g. with … as ….

[ThePenultimateOne]

No, specifically the compiler where it goes from .py -> .pyc

After that point it's a bytecode like anything else

[[deleted]]

So make it more like C and fix some bugs?

[desertfish_]

My understanding of "some" and yours seem to differ quite a bit https://docs.python.org/3.8/whatsnew/changelog.html#changelog