gh-126705: Make os.PathLike more like a protocol

Lib/os.py

@@ -1118,7 +1118,7 @@ def _fspath(path):
     fspath.__name__ = "fspath"
 
 
-class PathLike(abc.ABC):
+class PathLike(metaclass=abc.ABCMeta):
 
     """Abstract base class for implementing the file system path protocol."""
 

Lib/test/test_typing.py

@@ -8,6 +8,7 @@
 import inspect
 import itertools
 import operator
+import os
 import pickle
 import re
 import sys
@@ -4252,6 +4253,9 @@ def test_builtin_protocol_allowlist(self):
             class CustomProtocol(TestCase, Protocol):
                 pass
 
+        class CustomPathLikeProtocol(os.PathLike, Protocol):
+            pass
+
         class CustomContextManager(typing.ContextManager, Protocol):
             pass
 

Lib/typing.py

@@ -1943,6 +1943,7 @@ def _allow_reckless_class_checks(depth=2):
         'Hashable', 'Sized', 'Container', 'Collection', 'Reversible', 'Buffer',
     ],
     'contextlib': ['AbstractContextManager', 'AbstractAsyncContextManager'],
+    'os': ['PathLike'],
 }
 
 

Misc/NEWS.d/next/Library/2024-11-11-14-52-21.gh-issue-126705.0W7jFW.rst

@@ -0,0 +1 @@
+Allow :class:`os.PathLike` to be a base for Protocols.