Implement PEP 585 (Type Hinting Generics In Standard Collections)

[gvanrossum]

BPO	39481
Nosy	@gvanrossum, @ambv, @serhiy-storchaka, @ethanhs, @miss-islington, @isidentical, @gousaiyang
PRs	bpo-39481: Implementation for PEP 585 #18239 bpo-39481: Generic alias to os.DirEntry #19415 bpo-39481: Generic alias for itertools.chain #19417 bpo-39481: Add GenericAlias support to ipaddress.py #19418 bpo-39481: Make enumerate, AsyncGeneratorType, mmap generic #19421 bpo-39481: PEP 585 for difflib, filecmp, fileinput #19422 bpo-39481: PEP 585 for a variety of modules #19423 bpo-39481: Make dataclasses.Field, contextvars.Token, ... #19425 bpo-39481: Make functools.cached_property, partial, ... #19427 bpo-39481: Generic alias support to ctypes.Array, LibraryLoader... #19434 bpo-39481: Generic alias support to mp.ValueProxy, mp.ApplyResult, mp… #19435 bpo-39481: fix test_genericalias on Android #19469 bpo-39481: Make weakref and WeakSet generic #19497 bpo-39481: remove generic classes from ipaddress/mmap #20045 bpo-39481: Fix duplicate SimpleQueue type in test_genericalias.py #22619 [3.9] bpo-39481: Fix duplicate SimpleQueue type in test_genericalias.py (GH-22619) #22624

^{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 2020-07-25.21:57:06.912>
created_at = <Date 2020-01-28.17:16:57.906>
labels = ['interpreter-core', 'type-bug', '3.9']
title = 'Implement PEP 585 (Type Hinting Generics In Standard Collections)'
updated_at = <Date 2020-10-12.23:52:11.592>
user = 'https://github.com/gvanrossum'

bugs.python.org fields:

activity = <Date 2020-10-12.23:52:11.592>
actor = 'gvanrossum'
assignee = 'none'
closed = True
closed_date = <Date 2020-07-25.21:57:06.912>
closer = 'gvanrossum'
components = ['Interpreter Core']
creation = <Date 2020-01-28.17:16:57.906>
creator = 'gvanrossum'
dependencies = []
files = []
hgrepos = []
issue_num = 39481
keywords = ['patch']
message_count = 29.0
messages = ['360885', '364311', '365357', '365914', '365916', '365936', '365943', '365949', '366102', '366104', '366105', '366106', '366108', '366109', '366131', '366288', '366309', '366311', '366333', '366366', '366367', '366464', '366468', '366476', '367244', '368697', '374286', '378343', '378535']
nosy_count = 7.0
nosy_names = ['gvanrossum', 'lukasz.langa', 'serhiy.storchaka', 'ethan smith', 'miss-islington', 'BTaskaya', 'gousaiyang']
pr_nums = ['18239', '19415', '19417', '19418', '19421', '19422', '19423', '19425', '19427', '19434', '19435', '19469', '19497', '20045', '22619', '22624']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39481'
versions = ['Python 3.9']

[gvanrossum]

See PEP-585, which is still under review and may change in response to this work.

https://www.python.org/dev/peps/pep-0585/

[ambv]

Submitted a request for consideration by the Steering Council: python/steering-council#21

[gvanrossum]

The SC approved the PEP!

Łukasz, do you want to submit the PR to update the PEP status?

We should get the implementation reviewed (e.g. by Serhiy) and land it before alpha 6 goes out, April 22 (we should aim for a week before at least).

[gvanrossum]

New changeset 48b069a by Guido van Rossum in branch 'master':
bpo-39481: Implementation for PEP-585 (bpo-18239)
48b069a

[gvanrossum]

The base implementation has landed. We still need docs, and I'm sure that the alpha and beta release cycle will find small things that need to be improved.

Perhaps the next priority is an update for Doc/whatsnew/3.9.rst.

[isidentical]

@gvanrossum is new types going to support generic alias protocol or this subset will be kept? Like typeshed uses os.DirEntry as a generic, but in reality it is not. (#17561)

[gvanrossum]

Ethan Smith produced a list of types that are Generic in typeshed but not in the stdlib. So these could be added.

gvanrossum#1 (comment)

[gvanrossum]

New changeset f9dd51e by Batuhan Taşkaya in branch 'master':
bpo-39481: Make os.DirEntry generic (GH-19415)
f9dd51e

[gvanrossum]

New changeset 2fa67df by Batuhan Taşkaya in branch 'master':
bpo-39481: PEP-585 for ipaddress.py (GH-19418)
2fa67df