bpo-39481: Implementation for PEP 585 (#18239)
This implements things like `list[int]`,
which returns an object of type `types.GenericAlias`.
This object mostly acts as a proxy for `list`,
but has attributes `__origin__` and `__args__`
that allow recovering the parts (with values `list` and `(int,)`.
There is also an approximate notion of type variables;
e.g. `list[T]` has a `__parameters__` attribute equal to `(T,)`.
Type variables are objects of type `typing.TypeVar`.
diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
index 524ab7c..f4cba0f 100644
--- a/Lib/test/test_tempfile.py
+++ b/Lib/test/test_tempfile.py
@@ -10,6 +10,7 @@
import warnings
import contextlib
import stat
+import types
import weakref
from unittest import mock
@@ -1222,8 +1223,8 @@
self.assertEqual(os.fstat(f.fileno()).st_size, 20)
def test_class_getitem(self):
- self.assertIs(tempfile.SpooledTemporaryFile[bytes],
- tempfile.SpooledTemporaryFile)
+ self.assertIsInstance(tempfile.SpooledTemporaryFile[bytes],
+ types.GenericAlias)
if tempfile.NamedTemporaryFile is not tempfile.TemporaryFile: