Implement asyncio.Runner context manager

[asvetlov]

BPO	47062
Nosy	@asvetlov, @zware, @1st1, @kumaraditya303
PRs	bpo-47062: Implement asyncio.Runner context manager #31799 bpo-47062: Rename factory argument to loop_factory #32113

^{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 = None
closed_at = <Date 2022-03-24.19:51:47.800>
created_at = <Date 2022-03-18.20:44:42.359>
labels = ['3.11', 'expert-asyncio']
title = 'Implement asyncio.Runner context manager'
updated_at = <Date 2022-03-25.22:26:35.045>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2022-03-25.22:26:35.045>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-24.19:51:47.800>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2022-03-18.20:44:42.359>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 47062
keywords = ['patch']
message_count = 5.0
messages = ['415527', '415971', '415990', '416016', '416021']
nosy_count = 4.0
nosy_names = ['asvetlov', 'zach.ware', 'yselivanov', 'kumaraditya']
pr_nums = ['31799', '32113']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue47062'
versions = ['Python 3.11']

[asvetlov]

Sometimes asyncio.run() is not enough.

For example, unittest test case needs to call several async functions (setup, test, teardown) from the synchronous code using the same execution context and event loop.

The proposal provides the following:

with Runner() as runner:
 runner.run(async_func())

[asvetlov]

New changeset 4119d2d by Andrew Svetlov in branch 'main':
bpo-47062: Implement asyncio.Runner context manager (GH-31799)
4119d2d

[kumaraditya303]

With this change, Github Actions fails first time and it passes in the second rerun of running asyncio tests.

See https://github.com/python/cpython/runs/5682275663?check_suite_focus=true and main branch.

[asvetlov]

I believe the error is fixed by bpo-47118

[asvetlov]

New changeset bad6ffa by Andrew Svetlov in branch 'main':
bpo-47062: Rename factory argument to loop_factory (GH-32113)
bad6ffa

[encukou]

It seems that this commit broke tests in aiohttp: aio-libs/aiohttp#6757 (comment)

[graingert]

@encukou I have an issue here #93896 and a PR here #94058