Use uv lock file when installing dependencies in noxfile

examples/decorator/.template/pyproject.toml

@@ -6,5 +6,5 @@ build-backend = "maturin"
 name = "{{project-name}}"
 version = "0.1.0"
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]

examples/decorator/noxfile.py

@@ -12,5 +12,16 @@ def python(session: nox.Session):
     session.env["MATURIN_PEP517_ARGS"] = "--profile=dev"
     if args.features:
         session.env["MATURIN_PEP517_ARGS"] += f" --features={args.features}"
-    session.install(".[dev]")
+
+    session.run_install(
+        "uv",
+        "sync",
+        "--group=dev",
+        "--no-default-groups",
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
+
     session.run("pytest")

examples/decorator/pyproject.toml

@@ -15,5 +15,5 @@ classifiers = [
     "Operating System :: MacOS :: MacOS X",
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]

examples/getitem/.template/pyproject.toml

@@ -6,5 +6,5 @@ build-backend = "maturin"
 name = "{{project-name}}"
 version = "0.1.0"
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]

examples/getitem/noxfile.py

@@ -12,5 +12,16 @@ def python(session: nox.Session):
     session.env["MATURIN_PEP517_ARGS"] = "--profile=dev"
     if args.features:
         session.env["MATURIN_PEP517_ARGS"] += f" --features={args.features}"
-    session.install(".[dev]")
+
+    session.run_install(
+        "uv",
+        "sync",
+        "--group=dev",
+        "--no-default-groups",
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
+
     session.run("pytest")

examples/getitem/pyproject.toml

@@ -15,5 +15,5 @@ classifiers = [
     "Operating System :: MacOS :: MacOS X",
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]

examples/maturin-starter/.template/pyproject.toml

@@ -6,5 +6,5 @@ build-backend = "maturin"
 name = "{{project-name}}"
 version = "0.1.0"
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]

examples/maturin-starter/noxfile.py

@@ -13,5 +13,15 @@ def python(session):
     if args.features:
         session.env["MATURIN_PEP517_ARGS"] += f" --features={args.features}"
 
-    session.install(".[dev]")
+    session.run_install(
+        "uv",
+        "sync",
+        "--group=dev",
+        "--no-default-groups",
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
+
     session.run("pytest")

examples/maturin-starter/pyproject.toml

@@ -15,5 +15,5 @@ classifiers = [
     "Operating System :: MacOS :: MacOS X",
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]

examples/meson-starter/.template/pyproject.toml

@@ -9,7 +9,7 @@ build-backend = "mesonpy"
 name = "{{project-name}}"
 version = "0.1.0"
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]
 
 [tool.meson-python.args]

examples/plugin/plugin_api/noxfile.py

@@ -12,5 +12,16 @@ def python(session: nox.Session):
     session.env["MATURIN_PEP517_ARGS"] = "--profile=dev"
     if args.features:
         session.env["MATURIN_PEP517_ARGS"] += f" --features={args.features}"
-    session.install(".[dev]")
+
+    session.run_install(
+        "uv",
+        "sync",
+        "--group=dev",
+        "--no-default-groups",
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
+
     session.run("pytest")

examples/plugin/plugin_api/pyproject.toml

@@ -11,5 +11,5 @@ classifiers = [
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]

examples/setuptools-rust-starter/noxfile.py

@@ -4,5 +4,16 @@
 @nox.session
 def python(session: nox.Session):
     session.env["SETUPTOOLS_RUST_CARGO_PROFILE"] = "dev"
-    session.install(".[dev]")
+
+    session.run_install(
+        "uv",
+        "sync",
+        "--group=dev",
+        "--no-default-groups",
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
+
     session.run("pytest")

examples/setuptools-rust-starter/pyproject.toml

@@ -14,7 +14,7 @@ classifiers = [
     "Operating System :: MacOS :: MacOS X",
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]
 
 [tool.setuptools.packages.find]

examples/word-count/.template/pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "maturin"
 name = "{{project-name}}"
 version = "0.1.0"
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest"]
 
 [tool.pytest.ini_options]

examples/word-count/noxfile.py

@@ -1,10 +1,23 @@
 import argparse
+from collections.abc import Iterable
 
 import nox
 
 nox.options.sessions = ["test"]
 
 
+def uv_sync(session: nox.Session, groups: Iterable[str] = ()):
+    cmd = ["uv", "sync", "--locked", "--no-default-groups"]
+    cmd.extend([f"--group={g}" for g in groups])
+    session.run_install(
+        *cmd,
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
+
+
 @nox.session
 def test(session: nox.Session):
     parser = argparse.ArgumentParser()
@@ -14,7 +27,8 @@ def test(session: nox.Session):
     session.env["MATURIN_PEP517_ARGS"] = "--profile=dev"
     if args.features:
         session.env["MATURIN_PEP517_ARGS"] += f" --features={args.features}"
-    session.install(".[dev]")
+
+    uv_sync(session, groups=["dev"])
     session.run("pytest")
 
 
@@ -26,5 +40,6 @@ def bench(session: nox.Session):
 
     if args.features:
         session.env["MATURIN_PEP517_ARGS"] = f" --features={args.features}"
-    session.install(".[dev]")
+
+    uv_sync(session, groups=["dev"])
     session.run("pytest", "--benchmark-enable")

examples/word-count/pyproject.toml

@@ -15,7 +15,7 @@ classifiers = [
     "Operating System :: MacOS :: MacOS X",
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = ["pytest", "pytest-benchmark"]
 
 [tool.pytest.ini_options]

noxfile.py

@@ -32,6 +32,7 @@
         toml = None
 
 nox.options.sessions = ["test", "clippy", "rustfmt", "ruff", "rumdl", "docs", "typos"]
+nox.options.default_venv_backend = "uv"
 
 PYO3_DIR = Path(__file__).parent
 PYO3_TARGET = Path(os.environ.get("CARGO_TARGET_DIR", PYO3_DIR / "target")).absolute()
@@ -41,6 +42,26 @@
 FREE_THREADED_BUILD = bool(sysconfig.get_config_var("Py_GIL_DISABLED"))
 
 
+def uv_sync(
+    session: nox.Session,
+    groups: Iterable[str] = (),
+    packages: Iterable[str] = (),
+    no_install_project=False,
+):
+    cmd = ["uv", "sync", "--locked", "--no-default-groups"]
+    cmd.extend([f"--group={g}" for g in groups])
+    cmd.extend([f"--package={p}" for p in packages])
+    if no_install_project:
+        cmd.append("--no-install-project")
+    session.run_install(
+        *cmd,
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
+
+
 def _get_output(*args: str, env: dict[str, str] | None = None) -> str:
     try:
         return subprocess.run(
@@ -351,15 +372,16 @@ def bench(session: nox.Session) -> bool:
     _run_cargo(session, "bench", _BENCHES, *session.posargs)
 
 
-@nox.session()
+@nox.session
 def codspeed(session: nox.Session) -> bool:
     # rust benchmarks
     os.chdir(PYO3_DIR / "pyo3-benches")
     _run_cargo(session, "codspeed", "build")
     _run_cargo(session, "codspeed", "run")
     # python benchmarks
     os.chdir(PYO3_DIR / "pytests")
-    session.install(".[dev]", "pytest-codspeed")
+    uv_sync(session, ["dev"])
+    session.install("pytest-codspeed")
     _run(session, "pytest", "--codspeed", external=True)
 
 
@@ -1774,10 +1796,11 @@ def update_ui_tests(session: nox.Session):
 @nox.session(name="test-introspection")
 def test_introspection(session: nox.Session):
     with tempfile.TemporaryDirectory() as stub_dir:
+        uv_sync(
+            session, groups=["dev"], packages=["pyo3_pytests"], no_install_project=True
+        )
         session.install("maturin")
         session.install("ruff")
-        # `pytest-benchmark` backs the `--benchmark-disable` in `pytests/pyproject.toml`
-        session.install("pytest", "pytest-benchmark")
         options = []
         target = os.environ.get("CARGO_BUILD_TARGET")
         if target is not None:

pyproject.toml

@@ -67,6 +67,10 @@ style = "fenced"
 [tool.uv]
 package = false
 
+[tool.uv.workspace]
+members = ["pytests/", "pyo3-introspection/", "examples/*"]
+exclude = ["examples/plugin", "examples/meson-starter"]
+
 [tool.uv.dependency-groups]
 codecov = { requires-python = ">=3.14" }
 dev = { requires-python = ">=3.14" }

pytests/noxfile.py

@@ -8,6 +8,19 @@
 from nox.command import CommandFailed
 
 nox.options.sessions = ["test"]
+nox.options.default_venv_backend = "uv"
+
+
+def uv_sync(session: nox.Session, groups: Iterable[str] = []):
+    cmd = ["uv", "sync", "--locked", "--no-default-groups"]
+    cmd.extend([f"--group={g}" for g in groups])
+    session.run_install(
+        *cmd,
+        env={
+            "UV_PROJECT_ENVIRONMENT": session.virtualenv.location,
+            "UV_PYTHON": session.virtualenv.location,
+        },
+    )
 
 
 @nox.session
@@ -19,7 +32,8 @@ def test(session: nox.Session):
     session.env["MATURIN_PEP517_ARGS"] = "--profile=dev"
     if args.features:
         session.env["MATURIN_PEP517_ARGS"] += f" --features={args.features}"
-    session.install("-v", ".[dev]")
+
+    uv_sync(session, ["dev"])
 
     def try_install_binary(package: str, constraint: str):
         try:
@@ -52,15 +66,15 @@ def try_install_binary(package: str, constraint: str):
 
 @nox.session
 def bench(session: nox.Session):
-    session.install(".[dev]")
+    uv_sync(session, ["dev"])
     session.run("pytest", "--benchmark-enable", "--benchmark-only", *session.posargs)
 
 
 @nox.session
 def mypy(session: nox.Session):
     type_checker(
         session,
-        ("python", "-m", "mypy", "tests"),
+        ("mypy", "tests"),
     )
     # TODO: enable stubtest session.run_always("python", "-m", "mypy.stubtest", "pyo3_pytests")
 
@@ -69,17 +83,17 @@ def mypy(session: nox.Session):
 def pyrefly(session: nox.Session):
     type_checker(
         session,
-        ("python", "-m", "pyrefly", "check", "tests"),
+        ("pyrefly", "check", "--search-path", ".", "tests"),
     )
 
 
 def type_checker(session: nox.Session, command: Iterable[str]):
     session.env["MATURIN_PEP517_ARGS"] = "--profile=dev"
+    uv_sync(session, ["dev"])
     try:
         # We move the stubs where maturin is expecting them to be
         shutil.copytree("stubs", "pyo3_pytests")
         (Path("pyo3_pytests") / "py.typed").touch()
-        session.install(".[dev]")
 
         session.run_always(*command)
     finally:

pytests/pyproject.toml

@@ -32,7 +32,7 @@ requires-python = ">=3.9"
     "UP037",  # quoted annotations
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = [
     # mypy doesn't build on GraalPy when installed via uv
     "mypy~=1.0; platform_python_implementation != 'GraalVM'",