Issue 30406: async and await should be keywords in 3.7

According to PEP 492, async and await should be full keywords in Python 3.7, but this hasn't been implemented yet. I have a patch ready that I'll submit as a PR soon.

+1 These words are here to stay.   

That said, Guido needs to explicitly sign-off on any new language keywords.

Yes, I signed off on this when I approved that PEP.

On May 19, 2017 20:10, "Raymond Hettinger" <report@bugs.python.org> wrote:

>
> Raymond Hettinger added the comment:
>
> +1 These words are here to stay.
>
> That said, Guido needs to explicitly sign-off on any new language keywords.
>
> ----------
> assignee:  -> gvanrossum
> nosy: +gvanrossum, rhettinger
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue30406>
> _______________________________________
>

It's time to remove Yury's hacks from the parser and get a sane syntax ;-) I agree to make async and await real keywords!

New changeset ac317700ce7439e38a8b420218d9a5035bba92ed by Yury Selivanov (Jelle Zijlstra) in branch 'master':
bpo-30406: Make async and await proper keywords (#1669)
https://github.com/python/cpython/commit/ac317700ce7439e38a8b420218d9a5035bba92ed

Thanks a lot, Jelle!

According to PEP 492, async and await should have been deprecated in 3.5 and 3.6, but I don't think they have been :

await = 1
def f(async=True):
    ...

don't raise any deprecation warning in 3.6.

Since version 3.7 will break existing code with a SyntaxError, could it be possible to have something explicit in the SyntaxError message for these new keywords, for instance

SyntaxError : 'async' is a keyword

I don't speack C so I can't provide a patch, sorry.

> (...) don't raise any deprecation warning in 3.6.

python3 requires -Wd to display DeprecationWarning:

https://mail.python.org/pipermail/python-dev/2017-November/150149.html

Yury Selivanov: "We had PendingDeprecationWarning for async/await names in 3.5, and DeprecationWarning in 3.6."

New changeset f64aae46da292f71f6be750026cd052362e066bc by Łukasz Langa (Jelle Zijlstra) in branch 'master':
Revert "bpo-30406: Make async and await proper keywords (#1669)" (GH-6143)
https://github.com/python/cpython/commit/f64aae46da292f71f6be750026cd052362e066bc

New changeset a90df5085b51e8bb9de1c04c408bbef42ce6cbc3 by Miss Islington (bot) in branch '3.7':
Revert "bpo-30406: Make async and await proper keywords (GH-1669)" (GH-6143)
https://github.com/python/cpython/commit/a90df5085b51e8bb9de1c04c408bbef42ce6cbc3

Sadly if I get my way this will all be reverted -- see https://bugs.python.org/issue35975.  I'm working on a PR.

resolution: fixed
stage: resolved

messages: + msg293994
nosy: + rhettinger, gvanrossum