From: Batuhan Taşkaya <47358913+isidentical@users.noreply.github.com>
Date: Sun, 8 Dec 2019 20:31:15 +0000 (+0300)
Subject: bpo-38994: Implement __class_getitem__ for PathLike (GH-17498)
X-Git-Tag: v3.9.0a2~59
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=526606baf76e7a5309bb00f3bfaefa861a2014ba;p=thirdparty%2FPython%2Fcpython.git

bpo-38994: Implement __class_getitem__ for PathLike (GH-17498)



https://bugs.python.org/issue38994
---

diff --git a/Lib/os.py b/Lib/os.py
index 52d3f1d74158..c901bd1b8ed9 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -1072,6 +1072,9 @@ class PathLike(abc.ABC):
     def __subclasshook__(cls, subclass):
         return hasattr(subclass, '__fspath__')
 
+    def __class_getitem__(cls, type):
+        return cls
+
 
 if name == 'nt':
     class _AddedDllDirectory:
diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index d70fde0ea3b4..f0537cfea19a 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -777,6 +777,9 @@ class PurePath(object):
             return NotImplemented
         return self._cparts >= other._cparts
 
+    def __class_getitem__(cls, type):
+        return cls
+
     drive = property(attrgetter('_drv'),
                      doc="""The drive prefix (letter or UNC path), if any.""")
 
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index bf40cb1e8fa7..f44ddbad7d64 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -4048,6 +4048,9 @@ class TestPEP519(unittest.TestCase):
         self.assertRaises(ZeroDivisionError, self.fspath,
                           FakePath(ZeroDivisionError()))
 
+    def test_pathlike_class_getitem(self):
+        self.assertIs(os.PathLike[bytes], os.PathLike)
+
 
 class TimesTests(unittest.TestCase):
     def test_times(self):
diff --git a/Lib/test/test_pathlib.py b/Lib/test/test_pathlib.py
index 058a201aebc1..b8e7fcc2e302 100644
--- a/Lib/test/test_pathlib.py
+++ b/Lib/test/test_pathlib.py
@@ -2217,6 +2217,9 @@ class _BasePathTest(object):
 class PathTest(_BasePathTest, unittest.TestCase):
     cls = pathlib.Path
 
+    def test_class_getitem(self):
+        self.assertIs(self.cls[str], self.cls)
+
     def test_concrete_class(self):
         p = self.cls('a')
         self.assertIs(type(p),
diff --git a/Misc/NEWS.d/next/Library/2019-12-07-18-58-44.bpo-38994.IJYhz_.rst b/Misc/NEWS.d/next/Library/2019-12-07-18-58-44.bpo-38994.IJYhz_.rst
new file mode 100644
index 000000000000..b9cb4176350c
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-12-07-18-58-44.bpo-38994.IJYhz_.rst
@@ -0,0 +1 @@
+Implement ``__class_getitem__`` for ``os.PathLike``, ``pathlib.Path``