Add collections.abc.AsyncGenerator

[1st1]

BPO	28720
Nosy	@gvanrossum, @ned-deily, @1st1
Files	agen_abc.patch

^{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/1st1'
closed_at = <Date 2016-11-16.23:26:07.662>
created_at = <Date 2016-11-16.21:30:05.819>
labels = ['3.7', 'type-feature', 'library', 'release-blocker']
title = 'Add collections.abc.AsyncGenerator'
updated_at = <Date 2016-11-16.23:26:32.019>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2016-11-16.23:26:32.019>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2016-11-16.23:26:07.662>
closer = 'yselivanov'
components = ['Library (Lib)']
creation = <Date 2016-11-16.21:30:05.819>
creator = 'yselivanov'
dependencies = []
files = ['45513']
hgrepos = []
issue_num = 28720
keywords = ['patch']
message_count = 4.0
messages = ['280993', '281003', '281012', '281013']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'ned.deily', 'python-dev', 'yselivanov']
pr_nums = []
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue28720'
versions = ['Python 3.6', 'Python 3.7']

[1st1]

This patch adds collections.abc.AsyncGenerator (closely modelled after collections.abc.Generator).

Ned, is it OK if this goes into 3.6? This is something I completely forgot to do as part of PEP-525. This ABC is needed for asynchronous generators compiled with Cython and async-generator-like objects/wrappers.

I'll update the PEP if we can push this to 3.6.

[ned-deily]

OK for 3.6.0b4

[python-dev]

New changeset ae1dba7e7d04 by Yury Selivanov in branch '3.6':
Issue bpo-28720: Add collections.abc.AsyncGenerator.
https://hg.python.org/cpython/rev/ae1dba7e7d04

New changeset fb9c8fdef3ec by Yury Selivanov in branch 'default':
Merge 3.6 (issue bpo-28720)
https://hg.python.org/cpython/rev/fb9c8fdef3ec

[1st1]

Thanks Ned. I went ahead and committed the patch.