abc conflicts with __init_subclass__

[vladhoi]

BPO	43827
Nosy	@rhettinger, @pganssle, @vladhoi, @arhadthedev
PRs	bpo-43827: Fixed abc conflicts with __init_subclass__ #25385

^{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 = None
created_at = <Date 2021-04-13.07:57:15.219>
labels = ['extension-modules', 'type-bug', '3.8']
title = 'abc conflicts with __init_subclass__'
updated_at = <Date 2021-11-21.12:10:32.102>
user = 'https://github.com/vladhoi'

bugs.python.org fields:

activity = <Date 2021-11-21.12:10:32.102>
actor = 'arhadthedev'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2021-04-13.07:57:15.219>
creator = 'vladhoi'
dependencies = []
files = []
hgrepos = []
issue_num = 43827
keywords = ['patch']
message_count = 2.0
messages = ['390933', '406713']
nosy_count = 5.0
nosy_names = ['rhettinger', 'stutzbach', 'p-ganssle', 'vladhoi', 'arhadthedev']
pr_nums = ['25385']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43827'
versions = ['Python 3.8']

[vladhoi]

from abc import ABC


class A:
    def __init_subclass__(self):
        pass


class B(ABC, A, name="name"):
    pass

After initialising class B, this exception occurs, because multiple "name" arguments where provided:

Traceback (most recent call last):
  File "test_abc", line 9, in <module>
    class B(ABC, A, name="name"):
TypeError: __new__() got multiple values for argument 'name'

[arhadthedev]

Paul, PR OP made all changes requested; could you re-review please?

[JelleZijlstra]

Thanks for your contribution!