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bpo-39481: Implementation for PEP 585 (#18239)

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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`.
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Guido van Rossum 2020-04-07 09:50:06 -07:00 • committed by GitHub
parent 9cc3ebd7e0
commit 48b069a003
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Lib/test/test_os.py
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@ -25,6 +25,7 @@ import sysconfig
import tempfile
import threading
import time
import types
import unittest
import uuid
import warnings
@ -4191,7 +4192,7 @@ class TestPEP519(unittest.TestCase):
self.assertTrue(issubclass(FakePath, os.PathLike))
def test_pathlike_class_getitem(self):
self.assertIs(os.PathLike[bytes], os.PathLike)
self.assertIsInstance(os.PathLike[bytes], types.GenericAlias)
class TimesTests(unittest.TestCase):