refactor: tomllib in _compat

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

cibuildwheel/_compat/tomllib.py

@@ -0,0 +1,10 @@
+from __future__ import annotations
+
+import sys
+
+if sys.version_info >= (3, 11):
+    from tomllib import load  # noqa: TID251
+else:
+    from tomli import load  # noqa: TID251
+
+__all__ = ("load",)

cibuildwheel/options.py

@@ -15,13 +15,9 @@ from collections.abc import Callable, Generator, Iterable, Iterator, Mapping, Se
 from pathlib import Path
 from typing import Any, Dict, List, Union
 
-if sys.version_info >= (3, 11):
-    import tomllib
-else:
-    import tomli as tomllib
-
 from packaging.specifiers import SpecifierSet
 
+from ._compat import tomllib
 from ._compat.typing import Literal, NotRequired, TypedDict
 from .architecture import Architecture
 from .environment import EnvironmentParseError, ParsedEnvironment, parse_environment

cibuildwheel/projectfiles.py

@@ -7,10 +7,7 @@ import sys
 from pathlib import Path
 from typing import Any
 
-if sys.version_info >= (3, 11):
-    import tomllib
-else:
-    import tomli as tomllib
+from ._compat import tomllib
 
 if sys.version_info < (3, 8):
     Constant = ast.Str

cibuildwheel/util.py

@@ -23,12 +23,6 @@ from typing import Any, ClassVar, TextIO, TypeVar
 
 import bracex
 import certifi
-
-if sys.version_info >= (3, 11):
-    import tomllib
-else:
-    import tomli as tomllib
-
 from filelock import FileLock
 from packaging.requirements import InvalidRequirement, Requirement
 from packaging.specifiers import SpecifierSet
@@ -36,6 +30,7 @@ from packaging.utils import parse_wheel_filename
 from packaging.version import Version
 from platformdirs import user_cache_path
 
+from ._compat import tomllib
 from ._compat.functools import cached_property
 from ._compat.typing import Final, Literal
 from .typing import PathOrStr, PlatformName