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‎Lib/os.py‎
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‎Lib/test/test_os.py‎
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‎Misc/NEWS.d/next/Library/2019-11-22-12-08-52.bpo-38878.EJ0cFf.rst‎
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@@ -26,6 +26,8 @@
 import sys
 import stat as st
 
+from _collections_abc import _check_methods
+
 _names = sys.builtin_module_names
 
 # Note:  more names are added to __all__ later.
@@ -1076,4 +1078,6 @@ def __fspath__(self):
 
     @classmethod
     def __subclasshook__(cls, subclass):
-        return hasattr(subclass, '__fspath__')
+        if cls is PathLike:
+            return _check_methods(subclass, '__fspath__')
+        return NotImplemented
@@ -3745,6 +3745,14 @@ def test_bad_pathlike(self):
         self.assertRaises(ZeroDivisionError, self.fspath,
                           FakePath(ZeroDivisionError()))
 
+    def test_pathlike_subclasshook(self):
+        # bpo-38878: subclasshook causes subclass checks
+        # true on abstract implementation.
+        class A(os.PathLike):
+            pass
+        self.assertFalse(issubclass(FakePath, A))
+        self.assertTrue(issubclass(FakePath, os.PathLike))
+
 
 class TimesTests(unittest.TestCase):
     def test_times(self):
 
@@ -0,0 +1,2 @@
+Fixed __subclasshook__ of :class:`os.PathLike` to return a correct result
+upon inheritence. Patch by Bar Harel.
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fixed __subclasshook__ of :class:`os.PathLike` to return a correct result
	`2`	`+upon inheritence. Patch by Bar Harel.`