add support for 3.13 and 3.14 (#87)

Author: ATTron

.github/workflows/ci.yaml

@@ -52,8 +52,12 @@ jobs:
         run: zig build fmt
 
   python:
-    name: Python bindings
+    name: Python ${{ matrix.python }} bindings
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ['3.10', '3.11', '3.12', '3.13', '3.14']
 
     steps:
       - name: Check out repository
@@ -62,7 +66,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: ${{ matrix.python }}
 
       - name: Set up Zig
         uses: mlugg/setup-zig@v2
@@ -74,11 +78,12 @@ jobs:
         run: |
           PYTHON_INCLUDE=$(python -c "import sysconfig; print(sysconfig.get_path('include'))")
           PYTHON_LIBDIR=$(python -c "import sysconfig; print(sysconfig.get_config_var('LIBDIR'))")
+          PYTHON_LIB=$(python -c "import sys; print(f'python{sys.version_info.major}.{sys.version_info.minor}')")
           echo "Python include: $PYTHON_INCLUDE"
           echo "Python libdir: $PYTHON_LIBDIR"
           zig build python-bindings \
             -Dpython-include="$PYTHON_INCLUDE" \
-            -Dpython-lib=python3.12 \
+            -Dpython-lib="$PYTHON_LIB" \
             -Dpython-lib-path="$PYTHON_LIBDIR" \
             -Doptimize=ReleaseFast
 

.github/workflows/python.yaml

@@ -14,6 +14,12 @@ jobs:
       matrix:
         include:
           # Linux x86_64
+          - os: ubuntu-latest
+            python: '3.14'
+            target: linux-x86_64
+          - os: ubuntu-latest
+            python: '3.13'
+            target: linux-x86_64
           - os: ubuntu-latest
             python: '3.12'
             target: linux-x86_64
@@ -24,6 +30,12 @@ jobs:
             python: '3.10'
             target: linux-x86_64
           # macOS ARM64
+          - os: macos-latest
+            python: '3.14'
+            target: macos-arm64
+          - os: macos-latest
+            python: '3.13'
+            target: macos-arm64
           - os: macos-latest
             python: '3.12'
             target: macos-arm64

bindings/python/pyproject.toml

@@ -14,6 +14,11 @@ classifiers = [
     "Development Status :: 3 - Alpha",
     "Intended Audience :: Science/Research",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering :: Astronomy",
 ]
 dependencies = [

bindings/python/src/python.zig

@@ -7,24 +7,29 @@ pub const c = @cImport({
 
 const std = @import("std");
 
-/// Zig's translate-c can't handle CPython 3.12+'s ob_refcnt_split union (ziglang/zig#3949).
-/// On 3.10/3.11 ob_refcnt is a plain field; on 3.12+ it's inside unnamed_0.
-inline fn refcnt(obj: *c.PyObject) *c.Py_ssize_t {
+// Zig's translate-c can't handle CPython's ob_refcnt union (ziglang/zig#3949).
+// 3.10-3.11 have ob_refcnt as a plain field, 3.12+ need the stable C API
+// because the union layout keeps changing across versions.
+pub inline fn incref(obj: *c.PyObject) void {
     if (@hasField(c.PyObject, "ob_refcnt")) {
-        return &obj.ob_refcnt;
+        obj.ob_refcnt += 1;
     } else {
-        return &obj.unnamed_0.ob_refcnt;
+        c.Py_SET_REFCNT(obj, c.Py_REFCNT(obj) + 1);
     }
 }
 
-pub inline fn incref(obj: *c.PyObject) void {
-    refcnt(obj).* += 1;
-}
-
 pub inline fn decref(obj: *c.PyObject) void {
-    refcnt(obj).* -= 1;
-    if (refcnt(obj).* == 0) {
-        obj.ob_type.*.tp_dealloc.?(obj);
+    if (@hasField(c.PyObject, "ob_refcnt")) {
+        obj.ob_refcnt -= 1;
+        if (obj.ob_refcnt == 0) {
+            obj.ob_type.*.tp_dealloc.?(obj);
+        }
+    } else {
+        const n = c.Py_REFCNT(obj) - 1;
+        c.Py_SET_REFCNT(obj, n);
+        if (n == 0) {
+            obj.ob_type.*.tp_dealloc.?(obj);
+        }
     }
 }