Make Task._step, Task._wakeup and Future._schedule_callback methods private

[1st1]

BPO	32643
Nosy	@asvetlov, @cjerdonek, @1st1
PRs	bpo-32643: Drop support for a few private Task and Future APIs. #5293

^{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 2018-01-24.16:31:19.162>
created_at = <Date 2018-01-24.05:32:19.660>
labels = ['type-feature', '3.7', 'expert-asyncio']
title = 'Make Task._step, Task._wakeup and Future._schedule_callback methods private'
updated_at = <Date 2018-01-24.16:31:19.161>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2018-01-24.16:31:19.161>
actor = 'yselivanov'
assignee = 'none'
closed = True
closed_date = <Date 2018-01-24.16:31:19.162>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2018-01-24.05:32:19.660>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 32643
keywords = ['patch']
message_count = 2.0
messages = ['310561', '310611']
nosy_count = 3.0
nosy_names = ['asvetlov', 'chris.jerdonek', 'yselivanov']
pr_nums = ['5293']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32643'
versions = ['Python 3.7']

[1st1]

I propose to drop support for overloading Task._step, Task._wakeup, and Future._schedule_callbacks.

This makes the implementation easier for us to maintain and optimize. It also makes it easier for alternative asyncio event loops and interops with other async frameworks.

[1st1]

New changeset 22feeb8 by Yury Selivanov in branch 'master':
bpo-32643: Drop support for a few private Task and Future APIs. (bpo-5293)
22feeb8