Add __exit__() method to event loops

[vporton]

BPO	32875
Nosy	@terryjreedy, @asvetlov, @vadmium, @1st1, @vporton
Superseder	bpo-24795: Make event loops with statement context managers

^{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 2018-02-24.02:39:47.861>
created_at = <Date 2018-02-19.18:43:31.675>
labels = ['type-feature', '3.8', 'expert-asyncio']
title = 'Add __exit__() method to event loops'
updated_at = <Date 2018-02-26.11:14:26.865>
user = 'https://github.com/vporton'

bugs.python.org fields:

activity = <Date 2018-02-26.11:14:26.865>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2018-02-24.02:39:47.861>
closer = 'terry.reedy'
components = ['asyncio']
creation = <Date 2018-02-19.18:43:31.675>
creator = 'porton'
dependencies = []
files = []
hgrepos = []
issue_num = 32875
keywords = []
message_count = 5.0
messages = ['312360', '312675', '312677', '312692', '312917']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'asvetlov', 'martin.panter', 'yselivanov', 'porton']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = '24795'
type = 'enhancement'
url = 'https://bugs.python.org/issue32875'
versions = ['Python 3.8']

[vporton]

Please add __exit__() method to event loops, to use them with with.

[terryjreedy]

Enhancements only go in future releases not yet in beta.

Do loops already have an __enter__ method, also required for with? What would you have the close method do? Preemptorially cancel all tasks and close the loop? With statement are usually for ensuring deterministic cleanup after the last substatement, such as closing a file. Can you give a short usage example?

[vadmium]

Maybe already discussed in bpo-24795?

[terryjreedy]

A. Svetlov, closing bpo-24795: "Superseded by asyncio.run() function."

[asvetlov]

Agree