Only test free-threaded Python on Linux

EliahKagan · Byron · commit 56038c3e0382 · 2025-03-12T20:28:08.000+08:00
For now, this omits macOS and Windows from the 3.13t ("threaded") tests. The plan in #2005 is to start without them, and no OS-specific problems have been identified so far. In particular, in the previous commit that adds 3.13t without excluding any operating systems, all tests in the macOS job passed as expected, and the Windows job had the same failure with the same message as in #1955, with no XFAIL changed to XPASS (which, if present, would suggest GC differences meriting further exploration of 3.13t on Windows).
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
@@ -17,8 +17,12 @@ jobs:
         exclude:
         - os-type: macos
           python-version: "3.7"  # Not available for the ARM-based macOS runners.
+        - os-type: macos
+          python-version: "3.13t"
         - os-type: windows
           python-version: "3.13"  # FIXME: Fix and enable Python 3.13 on Windows (#1955).
+        - os-type: windows
+          python-version: "3.13t"
         include:
         - os-ver: latest
         - os-type: ubuntu
