bpo-46483: Remove `__class_getitem__` from `pathlib.PurePath` (GH-30848)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>

Doc/whatsnew/3.11.rst

@@ -545,6 +545,9 @@ Removed
   Python 3.4 but has been broken since Python 3.7.
   (Contributed by Inada Naoki in :issue:`23882`.)
 
+* Remove ``__class_getitem__`` method from :class:`pathlib.PurePath`,
+  because it was not used and added by mistake in previous versions.
+  (Contributed by Nikita Sobolev in :issue:`46483`.)
 
 Porting to Python 3.11
 ======================

Lib/pathlib.py

@@ -12,7 +12,6 @@ from errno import ENOENT, ENOTDIR, EBADF, ELOOP
 from operator import attrgetter
 from stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
 from urllib.parse import quote_from_bytes as urlquote_from_bytes
-from types import GenericAlias
 
 
 __all__ = [
@@ -604,8 +603,6 @@ class PurePath(object):
             return NotImplemented
         return self._cparts >= other._cparts
 
-    __class_getitem__ = classmethod(GenericAlias)
-
     drive = property(attrgetter('_drv'),
                      doc="""The drive prefix (letter or UNC path), if any.""")
 

Lib/test/test_pathlib.py

@@ -2450,15 +2450,6 @@ class _BasePathTest(object):
     def test_complex_symlinks_relative_dot_dot(self):
         self._check_complex_symlinks(os.path.join('dirA', '..'))
 
-    def test_class_getitem(self):
-        from types import GenericAlias
-
-        alias = self.cls[str]
-        self.assertIsInstance(alias, GenericAlias)
-        self.assertIs(alias.__origin__, self.cls)
-        self.assertEqual(alias.__args__, (str,))
-        self.assertEqual(alias.__parameters__, ())
-
 
 class PathTest(_BasePathTest, unittest.TestCase):
     cls = pathlib.Path

Misc/NEWS.d/next/Library/2022-01-23-11-17-48.bpo-46483.j7qwWb.rst

@@ -1,2 +0,0 @@
-Change :meth:`pathlib.PurePath.__class_getitem__` to return
-:class:`types.GenericAlias`.

Misc/NEWS.d/next/Library/2022-01-24-13-00-09.bpo-46483.9XnmKp.rst

@@ -0,0 +1 @@
+Remove :meth:`~object.__class_getitem__` from :class:`pathlib.PurePath` as this class was not supposed to be generic.