start testing on free-threaded-python (ipython#15007)

Author: Carreau

.github/workflows/test.yml

@@ -15,6 +15,7 @@ on:
 jobs:
   test:
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 15
     # Disable scheduled CI runs on forks
     if: github.event_name != 'schedule' || github.repository_owner == 'ipython'
     strategy:
@@ -28,13 +29,9 @@ jobs:
           - os: macos-latest
             python-version: "3.11"
             deps: test_extra
-          # Tests minimal dependencies set
+          # free threaded, not with all dependencies
           - os: ubuntu-latest
-            python-version: "3.11"
-            deps: test
-          # Tests latest released Python version
-          - os: ubuntu-latest
-            python-version: "3.13"
+            python-version: "3.14t"
             deps: test
           # Tests latest development Python version
           - os: ubuntu-latest
@@ -72,13 +69,13 @@ jobs:
       if: ${{ ! contains( matrix.python-version, 'dev' ) }}
       run: |
         python -m pip install --only-binary ':all:' --upgrade pip setuptools wheel build
-        python -m pip install --only-binary ':all:' --no-binary curio --upgrade -e .[${{ matrix.deps }}]
+        python -m pip install --no-binary curio --no-binary psutil --no-binary tornado --upgrade -e .[${{ matrix.deps }}]
         python -m pip install --only-binary ':all:' --upgrade check-manifest pytest-cov pytest
     - name: Install and update Python dependencies (dev?)
       if: ${{ contains( matrix.python-version, 'dev' ) }}
       run: |
         python -m pip install --pre --upgrade pip setuptools wheel build
-        python -m pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --no-binary curio --upgrade -e .[${{ matrix.deps }}]
+        python -m pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --no-binary curio --no-binary psutil --no-binary tornado --upgrade -e .[${{ matrix.deps }}]
         python -m pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --upgrade check-manifest pytest-cov
     - name: Try building with Python build
       if: runner.os != 'Windows'  # setup.py does not support sdist on Windows

pyproject.toml

@@ -80,7 +80,7 @@ test_extra = [
     "ipython[matplotlib]",
     "nbformat",
     "nbclient",
-    "ipykernel",
+    "ipykernel>6.30",
     "numpy>=1.25",
     "pandas>2.0",
     "trio",

tests/test_interactiveshell.py

@@ -50,6 +50,18 @@ class DerivedInterrupt(KeyboardInterrupt):
     pass
 
 
+def test_stream_performance(capsys) -> None:
+    """It should be fast to execute."""
+    src = "for i in range(250_000): print(i)"
+    start = time.perf_counter()
+    ip.run_cell(src)
+    end = time.perf_counter()
+    # We try to read as otherwise on failure, pytest will print the 250k lines to stdout.
+    capsys.readouterr()
+    duration = end - start
+    assert duration < 10
+
+
 class InteractiveShellTestCase(unittest.TestCase):
     def test_naked_string_cells(self):
         """Test that cells with only naked strings are fully executed"""
@@ -85,15 +97,6 @@ def test_run_cell_multiline(self):
         self.assertEqual(res.success, True)
         self.assertEqual(res.result, None)
 
-    def test_stream_performance(self):
-        """It should be fast to execute."""
-        src = "for i in range(250_000): print(i)"
-        start = time.perf_counter()
-        ip.run_cell(src)
-        end = time.perf_counter()
-        duration = end - start
-        assert duration < 10
-
     def test_multiline_string_cells(self):
         "Code sprinkled with multiline strings should execute (GH-306)"
         ip.run_cell("tmp=0")

tests/test_run.py

@@ -170,6 +170,10 @@ def doctest_reset_del():
 # For some tests, it will be handy to organize them in a class with a common
 # setup that makes a temp file
 
+import sysconfig
+
+is_freethreaded = bool(sysconfig.get_config_var("Py_GIL_DISABLED"))
+
 
 class TestMagicRunPass(tt.TempFileMixin):
 
@@ -294,6 +298,7 @@ def test_run_second(self):
             _ip.run_line_magic("run", empty.fname)
             assert _ip.user_ns["afunc"]() == 1
 
+    @pytest.mark.xfail(is_freethreaded, reason="C-third leaks on free-threaded python")
     def test_tclass(self):
         mydir = os.path.dirname(__file__)
         tc = os.path.join(mydir, "tclass")