Active python versions

setup.py

@@ -68,6 +68,6 @@
             'check-python-versions = check_python_versions.cli:main',
         ],
     },
-    install_requires=['pyyaml'],
+    install_requires=['pyyaml', 'python-active-versions>=1.3.0'],
     zip_safe=False,
 )

src/check_python_versions/cli.py

@@ -14,6 +14,10 @@
 from io import StringIO
 from typing import Callable, Collection, Dict, List, Optional, Tuple
 
+from python_active_versions.python_active_versions import (
+    get_active_python_versions,
+)
+
 from . import __version__
 from .sources.all import ALL_SOURCES
 from .sources.base import SourceFile
@@ -370,6 +374,9 @@ def _main() -> None:
     parser.add_argument('--skip-non-packages', action='store_true',
                         help='skip arguments that are not Python packages'
                              ' without warning about them')
+    parser.add_argument('--python-versions', action='store_true',
+                        default=False,
+                        help='show active python versions')
     parser.add_argument('--only', metavar='FILES',
                         help='check only the specified files'
                              ' (comma-separated list, e.g.'
@@ -457,6 +464,14 @@ def _main() -> None:
         elif multiple:
             print("\n\nall ok!")
 
+    if args.python_versions and not (args.add or args.drop or args.update):
+        _python_versions = get_active_python_versions(docker_images=False,
+                                                      log_level='WARNING')
+        print('\n\nActive Python versions:')
+        for _version in _python_versions:
+            print(f"version: {_version['version']} - "
+                  f"latest software: {_version['latest_sw']}")
+
 
 def main() -> None:
     """The main function.

tests/test_cli_python_versions.py

@@ -0,0 +1,39 @@
+import sys
+import textwrap
+
+from unittest.mock import Mock, patch
+
+
+@patch('check_python_versions.cli.get_active_python_versions',
+       Mock(return_value=[{'version': '3.10', 'latest_sw': '3.10.5'},
+                          {'version': '3.11', 'latest_sw': '3.11.1'}])
+       )
+def test_main_show_python(monkeypatch, tmp_path, capsys):
+    monkeypatch.setattr(sys, 'argv', [
+        'check-python-versions',
+        str(tmp_path),
+        '--python-versions',
+        '--only', 'setup.py',
+    ])
+    setup_py = tmp_path / "setup.py"
+    setup_py.write_text(textwrap.dedent("""\
+            from setuptools import setup
+            setup(
+                name='foo',
+                classifiers=[
+                    'Programming Language :: Python :: 2.7',
+                    'Programming Language :: Python :: 3.6',
+                ],
+            )
+        """))
+    import check_python_versions.cli as cpv
+
+    cpv.main()
+    assert capsys.readouterr().out == textwrap.dedent("""\
+            setup.py says: 2.7, 3.6
+
+
+            Active Python versions:
+            version: 3.10 - latest software: 3.10.5
+            version: 3.11 - latest software: 3.11.1
+        """)

tox.ini

@@ -32,6 +32,7 @@ skip_install = true
 deps =
     mypy
     types-pyyaml
+    python_active_versions
 commands =
     mypy src setup.py {posargs}
 # not checking tests/ because I don't want strict mode there, and mypy