stdlib: add __slots__ (#14611)

stdlib/pathlib/__init__.pyi

@@ -29,6 +29,31 @@ if sys.version_info >= (3, 13):
     __all__ += ["UnsupportedOperation"]
 
 class PurePath(PathLike[str]):
+    if sys.version_info >= (3, 13):
+        __slots__ = (
+            "_raw_paths",
+            "_drv",
+            "_root",
+            "_tail_cached",
+            "_str",
+            "_str_normcase_cached",
+            "_parts_normcase_cached",
+            "_hash",
+        )
+    elif sys.version_info >= (3, 12):
+        __slots__ = (
+            "_raw_paths",
+            "_drv",
+            "_root",
+            "_tail_cached",
+            "_str",
+            "_str_normcase_cached",
+            "_parts_normcase_cached",
+            "_lines_cached",
+            "_hash",
+        )
+    else:
+        __slots__ = ("_drv", "_root", "_parts", "_str", "_hash", "_pparts", "_cached_cparts")
     if sys.version_info >= (3, 13):
         parser: ClassVar[types.ModuleType]
         def full_match(self, pattern: StrPath, *, case_sensitive: bool | None = None) -> bool: ...
@@ -108,10 +133,19 @@ class PurePath(PathLike[str]):
     if sys.version_info >= (3, 12):
         def with_segments(self, *args: StrPath) -> Self: ...
 
-class PurePosixPath(PurePath): ...
-class PureWindowsPath(PurePath): ...
+class PurePosixPath(PurePath):
+    __slots__ = ()
+
+class PureWindowsPath(PurePath):
+    __slots__ = ()
 
 class Path(PurePath):
+    if sys.version_info >= (3, 14):
+        __slots__ = ("_info",)
+    elif sys.version_info >= (3, 10):
+        __slots__ = ()
+    else:
+        __slots__ = ("_accessor",)
     if sys.version_info >= (3, 12):
         def __new__(cls, *args: StrPath, **kwargs: Unused) -> Self: ...  # pyright: ignore[reportInconsistentConstructor]
     else:
@@ -310,8 +344,11 @@ class Path(PurePath):
             self, top_down: bool = True, on_error: Callable[[OSError], object] | None = None, follow_symlinks: bool = False
         ) -> Iterator[tuple[Self, list[str], list[str]]]: ...
 
-class PosixPath(Path, PurePosixPath): ...
-class WindowsPath(Path, PureWindowsPath): ...
+class PosixPath(Path, PurePosixPath):
+    __slots__ = ()
+
+class WindowsPath(Path, PureWindowsPath):
+    __slots__ = ()
 
 if sys.version_info >= (3, 13):
     class UnsupportedOperation(NotImplementedError): ...