Enum: do not convert private names into members

[ethanfurman]

BPO	42517
Nosy	@warsaw, @ethanfurman, @miss-islington
PRs	bpo-42517: [Enum] do not convert private names into members #23722 [3.9] bpo-42517: [Enum] do not convert private names into members (GH-23722) #23748 [3.9] bpo-42517: [ENUM] update docs for changes coming in 3.11 #29113

^{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/ethanfurman'
closed_at = <Date 2020-12-14.23:58:05.919>
created_at = <Date 2020-11-30.22:17:33.854>
labels = ['type-bug', '3.9', '3.10']
title = 'Enum: do not convert private names into members'
updated_at = <Date 2021-10-20.23:11:51.215>
user = 'https://github.com/ethanfurman'

bugs.python.org fields:

activity = <Date 2021-10-20.23:11:51.215>
actor = 'ethan.furman'
assignee = 'ethan.furman'
closed = True
closed_date = <Date 2020-12-14.23:58:05.919>
closer = 'ethan.furman'
components = []
creation = <Date 2020-11-30.22:17:33.854>
creator = 'ethan.furman'
dependencies = []
files = []
hgrepos = []
issue_num = 42517
keywords = ['patch']
message_count = 5.0
messages = ['382200', '382795', '382814', '383024', '404538']
nosy_count = 4.0
nosy_names = ['barry', 'eli.bendersky', 'ethan.furman', 'miss-islington']
pr_nums = ['23722', '23748', '29113']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42517'
versions = ['Python 3.9', 'Python 3.10']

[ethanfurman]

Currently, private names such as '__location' will get both name mangled and converted into an attribute, while __location_ will get mangled, but not converted as the final name is sundered (e.g. _MyEnum__location_).

Just in case anyone is actually using private name Enum members we'll deprecate in 3.10, and in 3.11 private names will:

• not be converted
• not raise sunder errors

[ethanfurman]

Make that deprecate in 3.9, work correctly in 3.10.

[ethanfurman]

New changeset 7cf0aad by Ethan Furman in branch 'master':
bpo-42517: [Enum] do not convert private names into members (GH-23722)
7cf0aad

[ethanfurman]

New changeset aba12b6 by Miss Islington (bot) in branch '3.9':
[3.9] bpo-42517: [Enum] deprecate private name members (GH-23722) (GH-23748)
aba12b6

[ethanfurman]

New changeset 9733c96 by Ethan Furman in branch '3.9':
[3.9] bpo-42517: [ENUM] update docs for changes coming in 3.11 (GH-29113)
9733c96