Add supported CPython/PyPy versions to cargo package metadata (#4756)

* Add supported CPython/PyPy versions to cargo package metadata

* Update max pypy version to 3.11

Co-authored-by: David Hewitt <[email protected]>

* Address code review comments

---------

Co-authored-by: David Hewitt <[email protected]>

Author: messense

Cargo.toml

@@ -42,7 +42,7 @@ indexmap = { version = ">= 2.5.0, < 3", optional = true }
 jiff-02 = { package = "jiff", version = "0.2", optional = true }
 num-bigint = { version = "0.4.2", optional = true }
 num-complex = { version = ">= 0.4.6, < 0.5", optional = true }
-num-rational = {version = "0.4.1", optional = true }
+num-rational = { version = "0.4.1", optional = true }
 rust_decimal = { version = "1.15", default-features = false, optional = true }
 serde = { version = "1.0", optional = true }
 smallvec = { version = "1.0", optional = true }
@@ -65,7 +65,7 @@ rayon = "1.6.1"
 futures = "0.3.28"
 tempfile = "3.12.0"
 static_assertions = "1.1.0"
-uuid = {version = "1.10.0", features = ["v4"] }
+uuid = { version = "1.10.0", features = ["v4"] }
 
 [build-dependencies]
 pyo3-build-config = { path = "pyo3-build-config", version = "=0.23.5", features = ["resolve-config"] }

newsfragments/4756.packaging.md

@@ -0,0 +1 @@
+Add supported CPython/PyPy versions to cargo package metadata.

noxfile.py

@@ -17,6 +17,7 @@
     Iterable,
     Iterator,
     List,
+    Literal,
     Optional,
     Tuple,
     Generator,
@@ -41,11 +42,43 @@
 PYO3_GUIDE_SRC = PYO3_DIR / "guide" / "src"
 PYO3_GUIDE_TARGET = PYO3_TARGET / "guide"
 PYO3_DOCS_TARGET = PYO3_TARGET / "doc"
-PY_VERSIONS = ("3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13")
-PYPY_VERSIONS = ("3.9", "3.10", "3.11")
 FREE_THREADED_BUILD = bool(sysconfig.get_config_var("Py_GIL_DISABLED"))
 
 
+def _get_output(*args: str) -> str:
+    return subprocess.run(args, capture_output=True, text=True, check=True).stdout
+
+
+def _parse_supported_interpreter_version(
+    python_impl: Literal["cpython", "pypy"],
+) -> Tuple[str, str]:
+    output = _get_output("cargo", "metadata", "--format-version=1", "--no-deps")
+    cargo_packages = json.loads(output)["packages"]
+    # Check Python interpreter version support in package metadata
+    package = "pyo3-ffi"
+    metadata = next(pkg["metadata"] for pkg in cargo_packages if pkg["name"] == package)
+    version_info = metadata[python_impl]
+    assert "min-version" in version_info, f"missing min-version for {python_impl}"
+    assert "max-version" in version_info, f"missing max-version for {python_impl}"
+    return version_info["min-version"], version_info["max-version"]
+
+
+def _supported_interpreter_versions(
+    python_impl: Literal["cpython", "pypy"],
+) -> List[str]:
+    min_version, max_version = _parse_supported_interpreter_version(python_impl)
+    major = int(min_version.split(".")[0])
+    assert major == 3, f"unsupported Python major version {major}"
+    min_minor = int(min_version.split(".")[1])
+    max_minor = int(max_version.split(".")[1])
+    versions = [f"{major}.{minor}" for minor in range(min_minor, max_minor + 1)]
+    return versions
+
+
+PY_VERSIONS = _supported_interpreter_versions("cpython")
+PYPY_VERSIONS = _supported_interpreter_versions("pypy")
+
+
 @nox.session(venv_backend="none")
 def test(session: nox.Session) -> None:
     test_rust(session)
@@ -931,10 +964,6 @@ def _run_cargo_set_package_version(
     _run(session, *command, external=True)
 
 
-def _get_output(*args: str) -> str:
-    return subprocess.run(args, capture_output=True, text=True, check=True).stdout
-
-
 def _for_all_version_configs(
     session: nox.Session, job: Callable[[Dict[str, str]], None]
 ) -> None:

pyo3-ffi/Cargo.toml

@@ -46,3 +46,11 @@ pyo3-build-config = { path = "../pyo3-build-config", version = "=0.23.5", featur
 
 [lints]
 workspace = true
+
+[package.metadata.cpython]
+min-version = "3.7"
+max-version = "3.13"  # inclusive
+
+[package.metadata.pypy]
+min-version = "3.9"
+max-version = "3.11"  # inclusive