Fix asyncio to support instantiation of new event loops in subprocesses

[1st1]

BPO	29703
Nosy	@larryhastings, @ned-deily, @1st1
PRs	bpo-29703: asyncio: Fix creating new event loops in child processes. #404 bpo-29703: asyncio: Fix creating new event loops in child processes #410 bpo-29703: asyncio: Fix creating new event loops in child processes. (#404) #411 [Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552

^{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 2017-03-03.19:28:23.958>
created_at = <Date 2017-03-02.21:55:45.240>
labels = ['type-bug', '3.7', 'release-blocker', 'expert-asyncio']
title = 'Fix asyncio to support instantiation of new event loops in subprocesses'
updated_at = <Date 2017-03-31.16:36:25.591>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2017-03-31.16:36:25.591>
actor = 'dstufft'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2017-03-03.19:28:23.958>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2017-03-02.21:55:45.240>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 29703
keywords = ['3.5regression', '3.6regression']
message_count = 8.0
messages = ['288835', '288836', '288837', '288915', '288919', '290336', '290337', '290340']
nosy_count = 3.0
nosy_names = ['larry', 'ned.deily', 'yselivanov']
pr_nums = ['404', '410', '411', '552']
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue29703'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']

[1st1]

Proxy for python/asyncio#497

Ned, this needs to be in 3.6.1, working code from 3.4 doesn't work in 3.6.0: http://stackoverflow.com/questions/42546099/python-asyncio-migrate-from-3-4-to-3-5/42566336#42566336

[ned-deily]

OK. I assume you will make PRs for python/cpython and cherry-pack to the 3.6 and 3.5 branches?

[1st1]

OK. I assume you will make PRs for python/cpython and cherry-pack to the 3.6 and 3.5 branches?

Yes, working on it!

[ned-deily]

With the PRs merged, can this issue be closed now?

[1st1]

Yes, closing the issue. Thanks, Ned!

[1st1]

New changeset 8b73b61 by Yury Selivanov in branch '3.5':
bpo-29703: asyncio: Fix creating new event loops in child processes. (#411)
8b73b61

[1st1]

New changeset 01e5230 by Yury Selivanov in branch '3.6':
bpo-29703: asyncio: Fix creating new event loops in child processes. (#404) (#410)
01e5230