Look up __aenter__ before __aexit__ in the async with statement

[maggyero]

BPO	39048
Nosy	@brettcannon, @rhettinger, @ncoghlan, @asvetlov, @1st1, @maggyero
PRs	bpo-39048: Look up __aenter__ before __aexit__ in the async with statement #17609

^{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 2020-01-14.11:59:46.828>
created_at = <Date 2019-12-14.19:58:37.561>
labels = ['interpreter-core', 'type-feature', '3.9']
title = 'Look up __aenter__ before __aexit__ in the async with statement'
updated_at = <Date 2020-01-14.12:21:10.260>
user = 'https://github.com/maggyero'

bugs.python.org fields:

activity = <Date 2020-01-14.12:21:10.260>
actor = 'maggyero'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-14.11:59:46.828>
closer = 'ncoghlan'
components = ['Interpreter Core']
creation = <Date 2019-12-14.19:58:37.561>
creator = 'maggyero'
dependencies = []
files = []
hgrepos = []
issue_num = 39048
keywords = []
message_count = 2.0
messages = ['358403', '359967']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'rhettinger', 'ncoghlan', 'asvetlov', 'yselivanov', 'maggyero']
pr_nums = ['17609']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39048'
versions = ['Python 3.9']

[maggyero]

Following https://bugs.python.org/issue27100 which did it for the with statement, what was left to do was to reorder the __aenter__ and __aexit__ method checks for the async with statement.

I have opened a PR for this here: #17609

[ncoghlan]

New changeset 1d1b97a by Nick Coghlan (Géry Ogam) in branch 'master':
bpo-39048: Look up __aenter__ before __aexit__ in async with (GH-17609)
1d1b97a