Remove _PySys_GetObjectId / _PySys_GetObjectId

[corona10]

BPO	46987
Nosy	@pitrou, @vstinner, @ericsnowcurrently, @corona10, @arhadthedev
PRs	bpo-46987: Remove _PySys_GetObjectId / _PySys_GetObjectId #31835

^{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 2022-03-14.12:48:17.491>
created_at = <Date 2022-03-11.14:08:22.317>
labels = ['expert-C-API', 'type-feature', '3.11']
title = 'Remove _PySys_GetObjectId / _PySys_GetObjectId'
updated_at = <Date 2022-03-14.12:48:17.490>
user = 'https://github.com/corona10'

bugs.python.org fields:

activity = <Date 2022-03-14.12:48:17.490>
actor = 'corona10'
assignee = 'corona10'
closed = True
closed_date = <Date 2022-03-14.12:48:17.491>
closer = 'corona10'
components = ['C API']
creation = <Date 2022-03-11.14:08:22.317>
creator = 'corona10'
dependencies = []
files = []
hgrepos = []
issue_num = 46987
keywords = ['patch']
message_count = 9.0
messages = ['414907', '414913', '414914', '414915', '414917', '414918', '414920', '414989', '415133']
nosy_count = 5.0
nosy_names = ['pitrou', 'vstinner', 'eric.snow', 'corona10', 'arhadthedev']
pr_nums = ['31835']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46987'
versions = ['Python 3.11']

[corona10]

There is no usage of _PySys_GetObjectId / _PySys_GetObjectId private APIs in CPython project.
Since these APIs use _Py_Identifier as the parameter, it looks good to be removed this time when there is no usage at all.
But before removing these APIs, I will investigate the current usage of external projects even if they are not intended to be used from outside.

[corona10]

./top_5000/datatable-1.0.0.tar.gz: datatable-1.0.0/src/core/python/obj.cc: _PySys_GetObjectId(&PyId_stdin) // borrowed ref
./top_5000/datatable-1.0.0.tar.gz: datatable-1.0.0/src/core/python/obj.cc: _PySys_GetObjectId(&PyId_stdout) // borrowed ref
./top_5000/datatable-1.0.0.tar.gz: datatable-1.0.0/src/core/python/obj.cc: _PySys_GetObjectId(&PyId_stderr) // borrowed ref
./top_5000/pickle5-0.0.12.tar.gz: pickle5-0.0.12/pickle5/_pickle.c: modules = _PySys_GetObjectId(&PyId_modules);

[corona10]

@pitrou

https://github.com/pitrou/pickle5-backport/blob/e6117502435aba2901585cc6c692fb9582545f08/pickle5/_pickle.c#L1937

Do you have a plan to use PySys_GetObject("modules") instead of _PySys_GetObjectId(&PyId_modules)?

[corona10]

@vstinner
From my view, PySys_GetObject is available since Python3.2 both APIs look safe to remove.

[vstinner]

https://pypi.org/project/pickle5/ should not be used on Python 3.8 and newer: it's a backport for Python 3.7 and older.

[vstinner]

From my view, PySys_GetObject is available since Python3.2 both APIs look safe to remove.

_PySys_GetObjectId() and _PySys_GetObjectId() are private API and can be removed anytime. We don't provide any backward compatibility warranty on the private API:
https://docs.python.org/dev/c-api/stable.html#c-api-stability

"Names prefixed by an underscore, such as _Py_InternalState, are private API that can change without notice even in patch releases."

[vstinner]

./top_5000/datatable-1.0.0.tar.gz: datatable-1.0.0/src/core/python/obj.cc: _PySys_GetObjectId(&PyId_stdout) // borrowed ref

It would be nice to notify datatable, or even propose a PR, if the _PySys_GetObjectId() is removed in Python 3.11.