PyArg_Parse* should deprecate 'u' and 'z' family.

[methane]

BPO	33195
Nosy	@methane, @serhiy-storchaka, @miss-islington
PRs	bpo-33195: Doc: Deprecate Py_UNICODE in c-api/arg #6329 [3.7] bpo-33195: Doc: Deprecate Py_UNICODE in c-api/arg (GH-6329) #6369 [3.6] bpo-33195: Doc: Deprecate Py_UNICODE in c-api/arg (GH-6329) #6382

^{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 2018-04-04.08:43:07.197>
created_at = <Date 2018-04-01.05:26:13.851>
labels = ['3.7', '3.8', 'docs']
title = "PyArg_Parse* should deprecate 'u' and 'z' family."
updated_at = <Date 2018-04-05.09:08:51.292>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2018-04-05.09:08:51.292>
actor = 'methane'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-04-04.08:43:07.197>
closer = 'methane'
components = ['Documentation']
creation = <Date 2018-04-01.05:26:13.851>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 33195
keywords = ['patch']
message_count = 6.0
messages = ['314761', '314765', '314865', '314919', '314921', '314971']
nosy_count = 4.0
nosy_names = ['methane', 'docs@python', 'serhiy.storchaka', 'miss-islington']
pr_nums = ['6329', '6369', '6382']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue33195'
versions = ['Python 3.7', 'Python 3.8']

[methane]

https://docs.python.org/3/c-api/arg.html

Py_UNICODE usage is not deprecated in this document.
Before thinking about raising warning, deprecate it in document first.

But... from when? Can I backport the "deprecated" doc to 3.6 or 3.5?

[serhiy-storchaka]

See also bpo-24009. We should get rid of using these units in the stdlib.

I'm not sure about deprecating Py_BuildValue() units right now. They can be redefined in terms of wchar_t, and they are already implemented with PyUnicode_FromWideChar().

[methane]

OK, I replaced Py_UNICODE with wchar_t in Py_BuildValue document.

[methane]

New changeset 42ec190 by INADA Naoki in branch 'master':
bpo-33195: Doc: Deprecate Py_UNICODE in c-api/arg (GH-6329)
42ec190

[miss-islington]

New changeset b8fc2d6 by Miss Islington (bot) in branch '3.7':
bpo-33195: Doc: Deprecate Py_UNICODE in c-api/arg (GH-6329)
b8fc2d6

[methane]

New changeset 29bc6f6 by INADA Naoki in branch '3.6':
bpo-33195: Doc: Deprecate Py_UNICODE in c-api/arg (GH-6329)
29bc6f6