async and await should be keywords in 3.7

[JelleZijlstra]

BPO	30406
Nosy	@gvanrossum, @rhettinger, @vstinner, @giampaolo, @ambv, @PierreQuentel, @1st1, @JelleZijlstra, @miss-islington
PRs	bpo-30406: Make async and await proper keywords #1669 bpo-30406: allow async/await in lib2to3 #6143 [3.7] Revert "bpo-30406: Make async and await proper keywords" (GH-6143) #6145

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/gvanrossum'
closed_at = <Date 2017-10-06.03:28:00.513>
created_at = <Date 2017-05-19.21:27:41.864>
labels = ['interpreter-core', 'type-bug', '3.7']
title = 'async and await should be keywords in 3.7'
updated_at = <Date 2019-02-27.23:41:58.653>
user = 'https://github.com/JelleZijlstra'

bugs.python.org fields:

activity = <Date 2019-02-27.23:41:58.653>
actor = 'gvanrossum'
assignee = 'gvanrossum'
closed = True
closed_date = <Date 2017-10-06.03:28:00.513>
closer = 'yselivanov'
components = ['Interpreter Core']
creation = <Date 2017-05-19.21:27:41.864>
creator = 'JelleZijlstra'
dependencies = []
files = []
hgrepos = []
issue_num = 30406
keywords = []
message_count = 11.0
messages = ['293976', '293994', '293997', '294003', '303793', '303794', '305549', '305634', '314046', '314051', '336783']
nosy_count = 9.0
nosy_names = ['gvanrossum', 'rhettinger', 'vstinner', 'giampaolo.rodola', 'lukasz.langa', 'quentel', 'yselivanov', 'JelleZijlstra', 'miss-islington']
pr_nums = ['1669', '6143', '6145']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30406'
versions = ['Python 3.7']

[JelleZijlstra]

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.

[rhettinger]

+1 These words are here to stay.

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

[gvanrossum]

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\>

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[vstinner]

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!

[1st1]

New changeset ac31770 by Yury Selivanov (Jelle Zijlstra) in branch 'master':
bpo-30406: Make async and await proper keywords (bpo-1669)
ac31770

[1st1]

Thanks a lot, Jelle!

[PierreQuentel]

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.

[vstinner]

(...) 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."

[ambv]

New changeset f64aae4 by Łukasz Langa (Jelle Zijlstra) in branch 'master':
Revert "bpo-30406: Make async and await proper keywords (bpo-1669)" (GH-6143)
f64aae4

[miss-islington]

New changeset a90df50 by Miss Islington (bot) in branch '3.7':
Revert "bpo-30406: Make async and await proper keywords (GH-1669)" (GH-6143)
a90df50

[gvanrossum]

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