PEP 641: Use an underscore in the version portion of Python 3.10 compatibility tag

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1891840
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1899553

354.patch

@@ -0,0 +1,76 @@
+From 6f862cdf60fec2f58796d2d8dcf891cc55721504 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= <miro@hroncok.cz>
+Date: Tue, 24 Nov 2020 12:03:14 +0100
+Subject: [PATCH] PEP 641: Use an underscore in the version portion of Python
+ 3.10 compatibility tag
+
+Regardless of the py_version_nodot variable.
+
+See https://www.python.org/dev/peps/pep-0641/
+See https://github.com/python/cpython/pull/22858#issuecomment-720608651
+---
+ packaging/tags.py  | 13 ++++++-------
+ tests/test_tags.py | 25 +++++++------------------
+ 2 files changed, 13 insertions(+), 25 deletions(-)
+
+diff --git a/packaging/tags.py b/packaging/tags.py
+index 289ed5c..8e695c7 100644
+--- a/packaging/tags.py
++++ b/packaging/tags.py
+@@ -782,14 +782,13 @@ def interpreter_name():
+ def interpreter_version(**kwargs):
+     # type: (bool) -> str
+     """
+-    Returns the version of the running interpreter.
++    Returns the version of the running interpreter for the wheel tag.
++
++    See https://www.python.org/dev/peps/pep-0641/
+     """
+-    warn = _warn_keyword_parameter("interpreter_version", kwargs)
+-    version = _get_config_var("py_version_nodot", warn=warn)
+-    if version:
+-        version = str(version)
+-    else:
+-        version = _version_nodot(sys.version_info[:2])
++    # warn kw only parameter is unused, kept for backwards compatibility
++    _warn_keyword_parameter("interpreter_version", kwargs)
++    version = _version_nodot(sys.version_info[:2])
+     return version
+ 
+ 
+diff --git a/tests/test_tags.py b/tests/test_tags.py
+index e9ea334..13121b3 100644
+--- a/tests/test_tags.py
++++ b/tests/test_tags.py
+@@ -172,24 +172,13 @@ def test_interpreter_short_names(self, mock_interpreter_name, monkeypatch):
+ 
+ 
+ class TestInterpreterVersion:
+-    def test_warn(self, monkeypatch):
+-        class MockConfigVar(object):
+-            def __init__(self, return_):
+-                self.warn = None
+-                self._return = return_
+-
+-            def __call__(self, name, warn):
+-                self.warn = warn
+-                return self._return
+-
+-        mock_config_var = MockConfigVar("38")
+-        monkeypatch.setattr(tags, "_get_config_var", mock_config_var)
+-        tags.interpreter_version(warn=True)
+-        assert mock_config_var.warn
+-
+-    def test_python_version_nodot(self, monkeypatch):
+-        monkeypatch.setattr(tags, "_get_config_var", lambda var, warn: "NN")
+-        assert tags.interpreter_version() == "NN"
++    def test_python_version_nodot_underscore(self, monkeypatch):
++        monkeypatch.setattr(sys, "version_info", (3, 20, 12))
++        assert tags.interpreter_version() == "3_20"
++
++    def test_python_version_nodot_no_underscore(self, monkeypatch):
++        monkeypatch.setattr(sys, "version_info", (3, 9, 12))
++        assert tags.interpreter_version() == "39"
+ 
+     @pytest.mark.parametrize(
+         "version_info,version_str",

python-packaging.spec

@@ -8,7 +8,7 @@
 
 Name:           python-%{pypi_name}
 Version:        20.4
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Core utilities for Python packages
 
 License:        BSD or ASL 2.0
@@ -19,6 +19,9 @@ BuildArch:      noarch
 # Remove dependency on six to make package lighter, backported from upstream
 Patch1:         %{url}/commit/39a70cce.patch
 
+# PEP 641: Use an underscore in the version portion of Python 3.10 compatibility tag
+Patch2:         %{url}/pull/354.patch
+
 BuildRequires:  python%{python3_pkgversion}-devel
 BuildRequires:  pyproject-rpm-macros
 
@@ -108,6 +111,11 @@ rm -rf html/_static/fonts/
 
 
 %changelog
+* Tue Nov 24 2020 Miro Hrončok <mhroncok@redhat.com> - 20.4-4
+- PEP 641: Use an underscore in the version portion of Python 3.10 compatibility tag
+- Resolves: rhbz#1891840
+- Resolves: rhbz#1899553
+
 * Fri Oct 02 2020 Miro Hrončok <mhroncok@redhat.com> - 20.4-3
 - Drop the dependency on six to make the package lighter