[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[Steve Dower]

Steve Dower  added the comment:

This has been blocking it: 
https://discuss.python.org/t/pep-641-using-an-underscore-in-the-version-portion-of-python-3-10-compatibility-tags/5513

Pablo (PEP delegate) has just posted his rejection though, so it will be fixed 
when packaging changes back to "310" from "3_10" and updates percolate out 
through the ecosystem.

Since moving to "4.x" is a breaking change, we can change to any system we like 
at that point. Well in advance of 31.0 being ambiguous.

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resolution:  -> rejected
stage: patch review -> resolved
status: open -> closed

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[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[Mark Shannon]

Mark Shannon  added the comment:

What's blocking this?
It is a real pain not to be able to install packages for 3.10.

I don't much care what the format is, but since there seems to be some 
difficulty in changing it, why not leave the output as `310`?

It isn't ambiguous, as long as we specify how to parse the number:
2 digits: XY.  X = major, Y = minor
3 digits: XYY. X = major, YY = minor
4 digits: XXYY. XX = major, YY = minor

So 31.0 will be `3100`.

That should be good for a millenium or so :)

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nosy: +Mark.Shannon

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[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[STINNER Victor]

STINNER Victor  added the comment:

Links about the "AssertionError: would build wheel with unsupported tag 
('cp310', 'cp310', 'linux_x86_64')" error:

* PEP 641 -- Using an underscore in the version portion of Python 3.10 
compatibility tags
  https://www.python.org/dev/peps/pep-0641/
* PEP 641 discussion:
  
https://discuss.python.org/t/pep-641-using-an-underscore-in-the-version-portion-of-python-3-10-compatibility-tags/5513
* CPython PR 20333: "bpo-40747: Make py_version_nodot 3_10 not 310"
  https://github.com/python/cpython/pull/20333
* wheel: "Fails to build wheel for Python 3.10"
  https://github.com/pypa/wheel/issues/354
* python3-setuptools: "python-setuptools fails to build with Python 3.10: 
AssertionError: would build wheel with unsupported tag ('cp310', 'cp310', 
'linux_x86_64')"
https://bugzilla.redhat.com/show_bug.cgi?id=1891840

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[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[Steve Dower]

Change by Steve Dower :


--
nosy: +steve.dower
nosy_count: 4.0 -> 5.0
pull_requests: +21801
pull_request: https://github.com/python/cpython/pull/22858

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[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[Florian Bruhin]

Change by Florian Bruhin :


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[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[Ned Deily]

Change by Ned Deily :


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nosy: +lukasz.langa, pablogsal

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[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[mattip]

Change by mattip :


--
keywords: +patch
pull_requests: +19601
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20333

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[issue40747] sysconfig.get_config_var("py_version_nodot") should return 3_10

[mattip]

New submission from mattip :

Over in packaging, that code expects 
`sysconfig.get_config_var("py_version_nodot")` to be consistent with 
`tags._version_nodot`, which expects 3_10 for python 3.10. See 
https://github.com/pypa/packaging/issues/308. The current value of 
`sysconfig.get_config_var("py_version_nodot")` (which comes from 
https://github.com/python/cpython/blob/master/Lib/sysconfig.py#L89) is `310` 
which is ambiguous.

--
components: Installation
messages: 369750
nosy: mattip
priority: normal
severity: normal
status: open
title: sysconfig.get_config_var("py_version_nodot") should return 3_10
type: behavior
versions: Python 3.10

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