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bpo-41428: Implementation for PEP 604 (GH-21515)

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See https://www.python.org/dev/peps/pep-0604/ for more information.

Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
This commit is contained in:
Maggie Moss 2020-09-09 13:23:24 -07:00 • committed by GitHub
parent fa8c9e7010
commit 1b4552c5e8
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13 changed files with 693 additions and 17 deletions
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32
Lib/test/test_isinstance.py
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@ -4,6 +4,7 @@
import unittest
import sys
import typing
@ -208,6 +209,25 @@ class TestIsInstanceIsSubclass(unittest.TestCase):
self.assertEqual(False, isinstance(AbstractChild(), Super))
self.assertEqual(False, isinstance(AbstractChild(), Child))
def test_isinstance_with_or_union(self):
self.assertTrue(isinstance(Super(), Super | int))
self.assertFalse(isinstance(None, str | int))
self.assertTrue(isinstance(3, str | int))
self.assertTrue(isinstance("", str | int))
self.assertTrue(isinstance([], typing.List | typing.Tuple))
self.assertTrue(isinstance(2, typing.List | int))
self.assertFalse(isinstance(2, typing.List | typing.Tuple))
self.assertTrue(isinstance(None, int | None))
self.assertFalse(isinstance(3.14, int | str))
with self.assertRaises(TypeError):
isinstance(2, list[int])
with self.assertRaises(TypeError):
isinstance(2, list[int] | int)
with self.assertRaises(TypeError):
isinstance(2, int | str | list[int] | float)
def test_subclass_normal(self):
# normal classes
self.assertEqual(True, issubclass(Super, Super))
@ -217,6 +237,8 @@ class TestIsInstanceIsSubclass(unittest.TestCase):
self.assertEqual(True, issubclass(Child, Child))
self.assertEqual(True, issubclass(Child, Super))
self.assertEqual(False, issubclass(Child, AbstractSuper))
self.assertTrue(issubclass(typing.List, typing.List|typing.Tuple))
self.assertFalse(issubclass(int, typing.List|typing.Tuple))
def test_subclass_abstract(self):
# abstract classes
@ -251,6 +273,16 @@ class TestIsInstanceIsSubclass(unittest.TestCase):
# blown
self.assertRaises(RecursionError, blowstack, isinstance, '', str)
def test_subclass_with_union(self):
self.assertTrue(issubclass(int, int | float | int))
self.assertTrue(issubclass(str, str | Child | str))
self.assertFalse(issubclass(dict, float|str))
self.assertFalse(issubclass(object, float|str))
with self.assertRaises(TypeError):
issubclass(2, Child | Super)
with self.assertRaises(TypeError):
issubclass(int, list[int] | Child)
def test_issubclass_refcount_handling(self):
# bpo-39382: abstract_issubclass() didn't hold item reference while
# peeking in the bases tuple, in the single inheritance case.