Standardize and centralize StrPath TypeAlias

Author: Avasam

newsfragments/4241.misc.rst

@@ -0,0 +1 @@
+Improvements to `Path`-related type annotations when it could be ``str | PathLike`` -- by :user:`Avasam`

setuptools/_normalization.py

@@ -4,13 +4,9 @@
 """
 
 import re
-from pathlib import Path
-from typing import Union
 
 from .extern import packaging
 
-_Path = Union[str, Path]
-
 # https://packaging.python.org/en/latest/specifications/core-metadata/#name
 _VALID_NAME = re.compile(r"^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])$", re.I)
 _UNSAFE_NAME_CHARS = re.compile(r"[^A-Z0-9._-]+", re.I)

setuptools/_path.py

@@ -2,7 +2,10 @@
 import sys
 from typing import Union
 
-_Path = Union[str, os.PathLike]
+if sys.version_info >= (3, 9):
+    StrPath = Union[str, os.PathLike[str]]  #  Same as _typeshed.StrPath
+else:
+    StrPath = Union[str, os.PathLike]
 
 
 def ensure_directory(path):
@@ -11,7 +14,7 @@ def ensure_directory(path):
     os.makedirs(dirname, exist_ok=True)
 
 
-def same_path(p1: _Path, p2: _Path) -> bool:
+def same_path(p1: StrPath, p2: StrPath) -> bool:
     """Differs from os.path.samefile because it does not require paths to exist.
     Purely string based (no comparison between i-nodes).
     >>> same_path("a/b", "./a/b")
@@ -30,7 +33,7 @@ def same_path(p1: _Path, p2: _Path) -> bool:
     return normpath(p1) == normpath(p2)
 
 
-def normpath(filename: _Path) -> str:
+def normpath(filename: StrPath) -> str:
     """Normalize a file/dir name for comparison purposes."""
     # See pkg_resources.normalize_path for notes about cygwin
     file = os.path.abspath(filename) if sys.platform == 'cygwin' else filename

setuptools/command/editable_wheel.py

@@ -33,7 +33,6 @@
     Protocol,
     Tuple,
     TypeVar,
-    Union,
 )
 
 from .. import (
@@ -43,6 +42,7 @@
     errors,
     namespaces,
 )
+from .._path import StrPath
 from ..discovery import find_package_path
 from ..dist import Distribution
 from ..warnings import (
@@ -55,8 +55,7 @@
 if TYPE_CHECKING:
     from wheel.wheelfile import WheelFile  # noqa
 
-_Path = Union[str, Path]
-_P = TypeVar("_P", bound=_Path)
+_P = TypeVar("_P", bound=StrPath)
 _logger = logging.getLogger(__name__)
 
 
@@ -181,7 +180,7 @@ def _find_egg_info_dir(self) -> Optional[str]:
         return next(candidates, None)
 
     def _configure_build(
-        self, name: str, unpacked_wheel: _Path, build_lib: _Path, tmp_dir: _Path
+        self, name: str, unpacked_wheel: StrPath, build_lib: StrPath, tmp_dir: StrPath
     ):
         """Configure commands to behave in the following ways:
 
@@ -256,7 +255,11 @@ def _collect_build_outputs(self) -> Tuple[List[str], Dict[str, str]]:
         return files, mapping
 
     def _run_build_commands(
-        self, dist_name: str, unpacked_wheel: _Path, build_lib: _Path, tmp_dir: _Path
+        self,
+        dist_name: str,
+        unpacked_wheel: StrPath,
+        build_lib: StrPath,
+        tmp_dir: StrPath,
     ) -> Tuple[List[str], Dict[str, str]]:
         self._configure_build(dist_name, unpacked_wheel, build_lib, tmp_dir)
         self._run_build_subcommands()
@@ -354,7 +357,7 @@ def _select_strategy(
         self,
         name: str,
         tag: str,
-        build_lib: _Path,
+        build_lib: StrPath,
     ) -> "EditableStrategy":
         """Decides which strategy to use to implement an editable installation."""
         build_name = f"__editable__.{name}-{tag}"
@@ -424,8 +427,8 @@ def __init__(
         self,
         dist: Distribution,
         name: str,
-        auxiliary_dir: _Path,
-        build_lib: _Path,
+        auxiliary_dir: StrPath,
+        build_lib: StrPath,
     ):
         self.auxiliary_dir = Path(auxiliary_dir)
         self.build_lib = Path(build_lib).resolve()
@@ -567,7 +570,7 @@ def _can_symlink_files(base_dir: Path) -> bool:
 
 
 def _simple_layout(
-    packages: Iterable[str], package_dir: Dict[str, str], project_dir: Path
+    packages: Iterable[str], package_dir: Dict[str, str], project_dir: StrPath
 ) -> bool:
     """Return ``True`` if:
     - all packages are contained by the same parent directory, **and**
@@ -649,7 +652,7 @@ def _find_top_level_modules(dist: Distribution) -> Iterator[str]:
 def _find_package_roots(
     packages: Iterable[str],
     package_dir: Mapping[str, str],
-    src_root: _Path,
+    src_root: StrPath,
 ) -> Dict[str, str]:
     pkg_roots: Dict[str, str] = {
         pkg: _absolute_root(find_package_path(pkg, package_dir, src_root))
@@ -659,7 +662,7 @@ def _find_package_roots(
     return _remove_nested(pkg_roots)
 
 
-def _absolute_root(path: _Path) -> str:
+def _absolute_root(path: StrPath) -> str:
     """Works for packages and top-level modules"""
     path_ = Path(path)
     parent = path_.parent

setuptools/config/_apply_pyprojecttoml.py

@@ -29,7 +29,7 @@
     Union,
     cast,
 )
-
+from .._path import StrPath
 from ..errors import RemovedConfigError
 from ..warnings import SetuptoolsWarning
 
@@ -38,15 +38,14 @@
     from setuptools.dist import Distribution  # noqa
 
 EMPTY: Mapping = MappingProxyType({})  # Immutable dict-like
-_Path = Union[os.PathLike, str]
 _DictOrStr = Union[dict, str]
-_CorrespFn = Callable[["Distribution", Any, _Path], None]
+_CorrespFn = Callable[["Distribution", Any, StrPath], None]
 _Correspondence = Union[str, _CorrespFn]
 
 _logger = logging.getLogger(__name__)
 
 
-def apply(dist: "Distribution", config: dict, filename: _Path) -> "Distribution":
+def apply(dist: "Distribution", config: dict, filename: StrPath) -> "Distribution":
     """Apply configuration dict read with :func:`read_configuration`"""
 
     if not config:
@@ -68,7 +67,7 @@ def apply(dist: "Distribution", config: dict, filename: _Path) -> "Distribution"
     return dist
 
 
-def _apply_project_table(dist: "Distribution", config: dict, root_dir: _Path):
+def _apply_project_table(dist: "Distribution", config: dict, root_dir: StrPath):
     project_table = config.get("project", {}).copy()
     if not project_table:
         return  # short-circuit
@@ -85,7 +84,7 @@ def _apply_project_table(dist: "Distribution", config: dict, root_dir: _Path):
             _set_config(dist, corresp, value)
 
 
-def _apply_tool_table(dist: "Distribution", config: dict, filename: _Path):
+def _apply_tool_table(dist: "Distribution", config: dict, filename: StrPath):
     tool_table = config.get("tool", {}).get("setuptools", {})
     if not tool_table:
         return  # short-circuit
@@ -153,7 +152,7 @@ def _guess_content_type(file: str) -> Optional[str]:
     raise ValueError(f"Undefined content type for {file}, {msg}")
 
 
-def _long_description(dist: "Distribution", val: _DictOrStr, root_dir: _Path):
+def _long_description(dist: "Distribution", val: _DictOrStr, root_dir: StrPath):
     from setuptools.config import expand
 
     if isinstance(val, str):
@@ -174,7 +173,7 @@ def _long_description(dist: "Distribution", val: _DictOrStr, root_dir: _Path):
         dist._referenced_files.add(cast(str, file))
 
 
-def _license(dist: "Distribution", val: dict, root_dir: _Path):
+def _license(dist: "Distribution", val: dict, root_dir: StrPath):
     from setuptools.config import expand
 
     if "file" in val:
@@ -184,7 +183,7 @@ def _license(dist: "Distribution", val: dict, root_dir: _Path):
         _set_config(dist, "license", val["text"])
 
 
-def _people(dist: "Distribution", val: List[dict], _root_dir: _Path, kind: str):
+def _people(dist: "Distribution", val: List[dict], _root_dir: StrPath, kind: str):
     field = []
     email_field = []
     for person in val:
@@ -244,7 +243,7 @@ def _unify_entry_points(project_table: dict):
         # intentional (for resetting configurations that are missing `dynamic`).
 
 
-def _copy_command_options(pyproject: dict, dist: "Distribution", filename: _Path):
+def _copy_command_options(pyproject: dict, dist: "Distribution", filename: StrPath):
     tool_table = pyproject.get("tool", {})
     cmdclass = tool_table.get("setuptools", {}).get("cmdclass", {})
     valid_options = _valid_command_options(cmdclass)

setuptools/config/expand.py

@@ -46,7 +46,7 @@
 
 from distutils.errors import DistutilsOptionError
 
-from .._path import same_path as _same_path
+from .._path import same_path as _same_path, StrPath
 from ..warnings import SetuptoolsWarning
 
 if TYPE_CHECKING:
@@ -55,7 +55,6 @@
     from distutils.dist import DistributionMetadata  # noqa
 
 chain_iter = chain.from_iterable
-_Path = Union[str, os.PathLike]
 _K = TypeVar("_K")
 _V = TypeVar("_V", covariant=True)
 
@@ -88,7 +87,7 @@ def __getattr__(self, attr):
 
 
 def glob_relative(
-    patterns: Iterable[str], root_dir: Optional[_Path] = None
+    patterns: Iterable[str], root_dir: Optional[StrPath] = None
 ) -> List[str]:
     """Expand the list of glob patterns, but preserving relative paths.
 
@@ -120,7 +119,7 @@ def glob_relative(
     return expanded_values
 
 
-def read_files(filepaths: Union[str, bytes, Iterable[_Path]], root_dir=None) -> str:
+def read_files(filepaths: Union[str, bytes, Iterable[StrPath]], root_dir=None) -> str:
     """Return the content of the files concatenated using ``\n`` as str
 
     This function is sandboxed and won't reach anything outside ``root_dir``
@@ -138,20 +137,20 @@ def read_files(filepaths: Union[str, bytes, Iterable[_Path]], root_dir=None) ->
     )
 
 
-def _filter_existing_files(filepaths: Iterable[_Path]) -> Iterator[_Path]:
+def _filter_existing_files(filepaths: Iterable[StrPath]) -> Iterator[StrPath]:
     for path in filepaths:
         if os.path.isfile(path):
             yield path
         else:
             SetuptoolsWarning.emit(f"File {path!r} cannot be found")
 
 
-def _read_file(filepath: Union[bytes, _Path]) -> str:
+def _read_file(filepath: Union[bytes, StrPath]) -> str:
     with open(filepath, encoding='utf-8') as f:
         return f.read()
 
 
-def _assert_local(filepath: _Path, root_dir: str):
+def _assert_local(filepath: StrPath, root_dir: str):
     if Path(os.path.abspath(root_dir)) not in Path(os.path.abspath(filepath)).parents:
         msg = f"Cannot access {filepath!r} (or anything outside {root_dir!r})"
         raise DistutilsOptionError(msg)
@@ -162,7 +161,7 @@ def _assert_local(filepath: _Path, root_dir: str):
 def read_attr(
     attr_desc: str,
     package_dir: Optional[Mapping[str, str]] = None,
-    root_dir: Optional[_Path] = None,
+    root_dir: Optional[StrPath] = None,
 ):
     """Reads the value of an attribute from a module.
 
@@ -197,7 +196,7 @@ def read_attr(
         return getattr(module, attr_name)
 
 
-def _find_spec(module_name: str, module_path: Optional[_Path]) -> ModuleSpec:
+def _find_spec(module_name: str, module_path: Optional[StrPath]) -> ModuleSpec:
     spec = importlib.util.spec_from_file_location(module_name, module_path)
     spec = spec or importlib.util.find_spec(module_name)
 
@@ -218,8 +217,8 @@ def _load_spec(spec: ModuleSpec, module_name: str) -> ModuleType:
 
 
 def _find_module(
-    module_name: str, package_dir: Optional[Mapping[str, str]], root_dir: _Path
-) -> Tuple[_Path, Optional[str], str]:
+    module_name: str, package_dir: Optional[Mapping[str, str]], root_dir: StrPath
+) -> Tuple[StrPath, Optional[str], str]:
     """Given a module (that could normally be imported by ``module_name``
     after the build is complete), find the path to the parent directory where
     it is contained and the canonical name that could be used to import it
@@ -254,7 +253,7 @@ def _find_module(
 def resolve_class(
     qualified_class_name: str,
     package_dir: Optional[Mapping[str, str]] = None,
-    root_dir: Optional[_Path] = None,
+    root_dir: Optional[StrPath] = None,
 ) -> Callable:
     """Given a qualified class name, return the associated class object"""
     root_dir = root_dir or os.getcwd()
@@ -270,7 +269,7 @@ def resolve_class(
 def cmdclass(
     values: Dict[str, str],
     package_dir: Optional[Mapping[str, str]] = None,
-    root_dir: Optional[_Path] = None,
+    root_dir: Optional[StrPath] = None,
 ) -> Dict[str, Callable]:
     """Given a dictionary mapping command names to strings for qualified class
     names, apply :func:`resolve_class` to the dict values.
@@ -282,7 +281,7 @@ def find_packages(
     *,
     namespaces=True,
     fill_package_dir: Optional[Dict[str, str]] = None,
-    root_dir: Optional[_Path] = None,
+    root_dir: Optional[StrPath] = None,
     **kwargs,
 ) -> List[str]:
     """Works similarly to :func:`setuptools.find_packages`, but with all
@@ -331,7 +330,7 @@ def find_packages(
     return packages
 
 
-def _nest_path(parent: _Path, path: _Path) -> str:
+def _nest_path(parent: StrPath, path: StrPath) -> str:
     path = parent if path in {".", ""} else os.path.join(parent, path)
     return os.path.normpath(path)
 
@@ -361,7 +360,7 @@ def canonic_package_data(package_data: dict) -> dict:
 
 
 def canonic_data_files(
-    data_files: Union[list, dict], root_dir: Optional[_Path] = None
+    data_files: Union[list, dict], root_dir: Optional[StrPath] = None
 ) -> List[Tuple[str, List[str]]]:
     """For compatibility with ``setup.py``, ``data_files`` should be a list
     of pairs instead of a dict.