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GeezerVison is showing github.com — ci: add free-threaded Python to CI by henryiii · Pull Request #1098 · pypa/packaging

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@henryiii

@henryiii henryiii commented Feb 23, 2026 •
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Adding free-threaded Python. Adding a little to the test printout to make it easier to ensure the correct Python is being used.

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@henryiii
henryiii marked this pull request as ready for review February 23, 2026 22:43
brettcannon
brettcannon approved these changes Feb 23, 2026
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@henryiii

henryiii commented Feb 23, 2026

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Actually, since we are testing now, let's add the trove classifier, too. Will add in a second.
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@henryiii

henryiii commented Feb 23, 2026 •
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I added the classifier. I did do a quick stress test:

+@nox.session(python=["3.13t", "3.14t"])
+def testsft(session: nox.Session) -> None:
+    """
+    Run the tests multiple times in threads, stress test.
+    """
+    session.install(*nox.project.dependency_groups(PYPROJECT, "test"), "pytest-run-parallel")
+    session.install("-e.")
+
+    session.run(
+        "python",
+        "-m",
+        "pytest",
+        "--parallel-threads=2",
+        "--iterations=2",
+        *session.posargs,
+        env={"PYTEST_RUN_PARALLEL_VERBOSE": "1"},
+    )
+
+

That doesn't run quite a few tests due to monkeypatch not being threadsafe, and it fails on the musllinux tests, even though those have a monkey patch, so I guess it's running them in sequence (?), and due to caching, that causes an expected call to fail. So only test-related issues, packaging itself seems fine.
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henryiii added 2 commits February 23, 2026 18:37
@henryiii
ci: add free-threaded Python to CI
129ebab 
Signed-off-by: Henry Schreiner <[email protected]>
@henryiii
chore: add classifier for free-threaded
c68d362 
Signed-off-by: Henry Schreiner <[email protected]>
@henryiii
henryiii force-pushed the henryiii/ci/ft branch from c99976c to c68d362 Compare February 23, 2026 23:37
notatallshaw
notatallshaw approved these changes Feb 24, 2026
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@henryiii
henryiii merged commit 65ed5e9 into pypa:main Feb 24, 2026
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@henryiii
henryiii deleted the henryiii/ci/ft branch February 24, 2026 03:08
@ngoldbaum

ngoldbaum commented Feb 24, 2026

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Thanks for handling this Henry!
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ngoldbaum pushed a commit to ngoldbaum/packaging that referenced this pull request Apr 1, 2026
@henryiii @ngoldbaum
ci: add free-threaded Python to CI (pypa#1098)
b10ce14 
* ci: add free-threaded Python to CI

Signed-off-by: Henry Schreiner <[email protected]>

* chore: add classifier for free-threaded

Signed-off-by: Henry Schreiner <[email protected]>

---------

Signed-off-by: Henry Schreiner <[email protected]>
This was referenced Apr 13, 2026
26.1 release plans #1149
Closed
docs: update changelog for 26.1 #1156
Merged
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@brettcannon brettcannon brettcannon approved these changes
@notatallshaw notatallshaw notatallshaw approved these changes

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4 participants

@henryiii @ngoldbaum @brettcannon @notatallshaw
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