Convert asyncio to async/await

[asvetlov]

BPO	32193
Nosy	@gvanrossum, @terryjreedy, @asvetlov, @1st1
PRs	bpo-32193: Convert asyncio to async/await usage #4753

^{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/asvetlov'
closed_at = <Date 2017-12-08.22:25:13.912>
created_at = <Date 2017-12-01.09:44:32.672>
labels = ['3.7', 'type-feature', 'library', 'expert-asyncio']
title = 'Convert asyncio to async/await'
updated_at = <Date 2017-12-08.22:25:13.911>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2017-12-08.22:25:13.911>
actor = 'asvetlov'
assignee = 'asvetlov'
closed = True
closed_date = <Date 2017-12-08.22:25:13.912>
closer = 'asvetlov'
components = ['Library (Lib)', 'asyncio']
creation = <Date 2017-12-01.09:44:32.672>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 32193
keywords = ['patch']
message_count = 6.0
messages = ['307375', '307392', '307393', '307394', '307403', '307872']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'terry.reedy', 'asvetlov', 'yselivanov']
pr_nums = ['4753']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32193'
versions = ['Python 3.7']

[asvetlov]

As discussed several times before we need to convert @coroutine / yield from to async/await.

All existing functionality should keep working (like yielding from new style coroutine and with (yield from lock).

We could deprecate the later though.

The change should be huge but there is no alternative, keeping yield from in stdlib looks uglier and uglier every year.

Unittests should be changed as well (keeping several yield from for checking backward compatibility is Ok).

Opinions?

[gvanrossum]

Yeah, I am in favor of this. How will we guarantee that clients using the old @coroutine/yield from idiom still work? We need to have separate tests for that.

[1st1]

How will we guarantee that clients using the old @coroutine/yield from idiom still work?

They are fully supported now, but we can add a few tests to ensure we won't break it.

[1st1]

Andrew, would it be OK if I make a PR?

[asvetlov]

Yuri please do

[asvetlov]

New changeset 5f841b5 by Andrew Svetlov in branch 'master':
bpo-32193: Convert asyncio to async/await usage (bpo-4753)
5f841b5