Use stdlib tomllib instead of tomli for Python 3.11+

Author: hugovk

setup.cfg

@@ -29,9 +29,9 @@ packages = find:
 install_requires =
     packaging>=20.0
     setuptools
-    tomli>=1.0.0 # keep in sync
     typing-extensions
     importlib-metadata;python_version < '3.8'
+    tomli>=1.0.0;python_version < '3.11' # keep in sync
 python_requires = >=3.7
 package_dir =
     =src

src/setuptools_scm/_integration/pyproject_reading.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 import warnings
 from typing import Any
 from typing import Callable
@@ -28,8 +29,11 @@ def project_name(self) -> str | None:
         return self.project.get("name")
 
 
-def lazy_tomli_load(data: str) -> TOML_RESULT:
-    from tomli import loads
+def lazy_toml_load(data: str) -> TOML_RESULT:
+    if sys.version_info >= (3, 11):
+        from tomllib import loads
+    else:
+        from tomli import loads
 
     return loads(data)
 
@@ -40,7 +44,7 @@ def read_pyproject(
     _load_toml: TOML_LOADER | None = None,
 ) -> PyProjectData:
     if _load_toml is None:
-        _load_toml = lazy_tomli_load
+        _load_toml = lazy_toml_load
     with open(name, encoding="UTF-8") as strm:
         data = strm.read()
     defn = _load_toml(data)

testing/test_integration.py

@@ -24,7 +24,8 @@ def wd(wd: WorkDir) -> WorkDir:
 
 
 def test_pyproject_support(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
-    pytest.importorskip("tomli")
+    if sys.version_info <= (3, 10):
+        pytest.importorskip("tomli")
     monkeypatch.delenv("SETUPTOOLS_SCM_DEBUG")
     pkg = tmp_path / "package"
     pkg.mkdir()
@@ -83,7 +84,8 @@ def test_pyproject_support(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> N
 
 @with_metadata_in
 def test_pyproject_support_with_git(wd: WorkDir, metadata_in: str) -> None:
-    pytest.importorskip("tomli")
+    if sys.version_info <= (3, 10):
+        pytest.importorskip("tomli")
     wd.write("pyproject.toml", PYPROJECT_FILES[metadata_in])
     wd.write("setup.py", SETUP_PY_FILES[metadata_in])
     wd.write("setup.cfg", SETUP_CFG_FILES[metadata_in])

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py{37,38,39,310}-{test,selfcheck},check_readme,check-dist,check-bootstrap
+envlist=py{37,38,39,310,311}-{test,selfcheck},check_readme,check-dist,check-bootstrap
 
 [pytest]
 testpaths=testing
@@ -27,7 +27,6 @@ skip_install=
 deps=
     pytest
     setuptools >= 45
-    tomli
     virtualenv>20
     typing_extensions
 commands=