Expose the coroutine object in asyncio task objects

[agronholm]

BPO	36999
Nosy	@asvetlov, @agronholm, @1st1, @miss-islington
PRs	bpo-36999: Add asyncio.Task.get_coro() #13680

^{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 2019-05-30.15:34:33.630>
created_at = <Date 2019-05-21.20:45:37.484>
labels = ['type-feature', '3.8', 'expert-asyncio']
title = 'Expose the coroutine object in asyncio task objects'
updated_at = <Date 2019-05-30.15:34:33.630>
user = 'https://github.com/agronholm'

bugs.python.org fields:

activity = <Date 2019-05-30.15:34:33.630>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-30.15:34:33.630>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2019-05-21.20:45:37.484>
creator = 'alex.gronholm'
dependencies = []
files = []
hgrepos = []
issue_num = 36999
keywords = ['patch']
message_count = 4.0
messages = ['343092', '343093', '343095', '343982']
nosy_count = 4.0
nosy_names = ['asvetlov', 'alex.gronholm', 'yselivanov', 'miss-islington']
pr_nums = ['13680']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36999'
versions = ['Python 3.8']

[agronholm]

Both curio and trio expose the coroutine object belonging to a task as the "coro" attribute. Asyncio exposes this as "_coro" (as does uvloop) but it would be nice to have at least a read-only attribute exposing this as part of the public API.

In some of my libraries I need this object, sometimes for debugging and other times for implementing "crazy" schemes like running parts of the the coroutine function code in a worker thread.

[1st1]

I've no problem with this. We can add a 'get_coro()' Task method (this is in line with asyncio usually having the "getter" api as opposed to properties).

[agronholm]

I'll look into making a PR.

[miss-islington]

New changeset 98ef920 by Miss Islington (bot) (Alex Grönholm) in branch 'master':
bpo-36999: Add asyncio.Task.get_coro() (GH-13680)
98ef920