Apply PEP 573 to abc module

[corona10]

BPO	40566
Nosy	@vstinner, @tiran, @corona10, @miss-islington
PRs	bpo-40566: Apply PEP 573 to abc module #20005

^{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/corona10'
closed_at = <Date 2020-05-09.08:34:19.842>
created_at = <Date 2020-05-08.16:37:38.539>
labels = ['interpreter-core', 'type-feature', '3.9']
title = 'Apply PEP 573 to abc module'
updated_at = <Date 2020-05-09.08:34:19.838>
user = 'https://github.com/corona10'

bugs.python.org fields:

activity = <Date 2020-05-09.08:34:19.838>
actor = 'corona10'
assignee = 'corona10'
closed = True
closed_date = <Date 2020-05-09.08:34:19.842>
closer = 'corona10'
components = ['Interpreter Core']
creation = <Date 2020-05-08.16:37:38.539>
creator = 'corona10'
dependencies = []
files = []
hgrepos = []
issue_num = 40566
keywords = ['patch']
message_count = 3.0
messages = ['368452', '368503', '368504']
nosy_count = 4.0
nosy_names = ['vstinner', 'christian.heimes', 'corona10', 'miss-islington']
pr_nums = ['20005']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40566'
versions = ['Python 3.9']

[corona10]

Since PEP-573 is landed, we can apply the PEP-573 to abc module.

[miss-islington]

New changeset 77c6146 by Dong-hee Na in branch 'master':
bpo-40566: Apply PEP-573 to abc module (GH-20005)
77c6146

[corona10]

I am now closing the issue. Thanks for the review