Add Task.get_loop() and Future.get_loop()

[1st1]

BPO	32415
Nosy	@asvetlov, @1st1
PRs	bpo-32415: Add asyncio.Task.get_loop() and Future.get_loop() #4992 bpo-32415: Add more tests #4995 bpo-32415: Fix "error is already set" #4999

^{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 2017-12-23.20:08:07.327>
created_at = <Date 2017-12-23.16:59:11.100>
labels = ['3.7', 'expert-asyncio']
title = 'Add Task.get_loop() and Future.get_loop()'
updated_at = <Date 2017-12-23.21:29:28.781>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2017-12-23.21:29:28.781>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2017-12-23.20:08:07.327>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2017-12-23.16:59:11.100>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 32415
keywords = ['patch']
message_count = 5.0
messages = ['308957', '308958', '308966', '308968', '308971']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['4992', '4995', '4999']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue32415'
versions = ['Python 3.7']

[1st1]

Currently, asyncio code accesses Future._loop and Task._loop property to validate the event loop and implement functions like "Task.all_tasks()". So the "_loop" is a semi-official public API that other Task & Future implementations must follow in order to be compatible with asyncio code.

I propose to add Future.get_loop() and Task.get_loop() methods, and soft-deprecate ._loop property.

[asvetlov]

Agree

[1st1]

New changeset ca9b36c by Yury Selivanov in branch 'master':
bpo-32415: Add asyncio.Task.get_loop() and Future.get_loop() (bpo-4992)
ca9b36c

[1st1]

New changeset a8fb079 by Yury Selivanov in branch 'master':
bpo-32415: Add more tests (bpo-4995)
a8fb079

[1st1]

New changeset 719ccbc by Yury Selivanov in branch 'master':
bpo-32415: Fix "error is already set" (bpo-4999)
719ccbc