Drop Python 3.9 and add 3.13 free-threaded CI job

Author: oscarbenjamin

.github/workflows/buildwheel.yml

@@ -107,7 +107,9 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04, windows-2019, macos-13, macos-14]
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13-dev']
+        # This list to be kept in sync with cibuildwheel config
+        # and python-requires in pyproject.toml.
+        python-version: ['3.10', '3.11', '3.12', '3.13-dev']
 
     steps:
       - uses: actions/setup-python@v5
@@ -209,6 +211,37 @@ jobs:
       - run: pip install -r requirements-dev.txt
       - run: bin/coverage.sh
 
+  # On new enough Ubuntu we can build against the system deb.
+  test_freethreaded:
+    name: Free-threaded ${{ matrix.python-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-24.04]
+        python-version: ['3.13-dev']
+    steps:
+      - uses: actions/checkout@v4
+      # Can't use actions/setup-python
+      # https://github.com/actions/setup-python/issues/771
+      # deadsnakes only works for Ubuntu...
+      - uses: deadsnakes/[email protected]
+        with:
+          python-version: ${{ matrix.python-version }}
+          nogil: true
+      - run: |
+          python --version --version
+          which python
+          python -c "import sysconfig; print(sysconfig.get_config_var('Py_GIL_DISABLED'))"
+          python -c "import sys; print(sys._is_gil_enabled())"
+      - run: sudo apt-get update
+      - run: sudo apt-get install libflint-dev
+      # Need Cython master until 3.1 is released
+      - run: pip install git+https://github.com/cython/cython.git@master
+      - run: pip install -r requirements-dev.txt
+      - run: pip install --no-build-isolation .
+      - run: python -m flint.test --verbose
+
   # Run SymPy test suite against python-flint master
   test_sympy:
     name: Test SymPy ${{ matrix.sympy-version }}

README.md

@@ -18,7 +18,7 @@ Author: Fredrik Johansson <[email protected]>
 Installation
 ------------
 
-Currently python-flint supports CPython versions 3.9-3.12. For Windows (x86-64)
+Currently python-flint supports CPython versions 3.10-3.13. For Windows (x86-64)
 or OSX (x86-64 or arm64) or Linux (x86-64 `manylinux_2_17`) there are CPython
 binary wheels for python-flint on PyPI. For these platforms python-flint can be
 installed simply with `pip`

pyproject.toml

@@ -2,7 +2,8 @@
 name = "python-flint"
 description = "Bindings for FLINT"
 version = "0.7.0a4"
-requires-python = ">= 3.9"
+# This needs to be in sync with README, cibuildwheel and CI config.
+requires-python = ">= 3.10"
 urls = {Homepage = "https://github.com/flintlib/python-flint"}
 authors = [
     {name = "Fredrik Johansson", email = "[email protected]"},
@@ -57,8 +58,13 @@ package = "flint"
 [tool.cibuildwheel]
 # requires-python needs to keep in sync with this and also the list of Python
 # versions the wheels are tested against in CI.
-build = "cp39-* cp310-* cp311-* cp312-* cp313-*"
+build = "cp310-* cp311-* cp312-* cp313-*"
 skip = "*-win32 *-manylinux_i686 *-musllinux_*"
+
+# This is needed for free-threaded wheels:
+# build = "cp313t-*"
+# free-threaded-support = true
+
 manylinux-x86_64-image = "manylinux2014"
 manylinux-i686-image = "manylinux2014"
 test-command = "python -c \"import flint; print(str(flint.fmpz(2)))\""