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bpo-45663: Fix is_dataclass() for dataclasses which are subclasses of types.GenericAlias (GH-29294)

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(cherry picked from commit 446be16686)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2021-12-05 13:25:43 -08:00 • committed by GitHub
parent 52a9a71fe6
commit 19050711f5
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3 changed files with 15 additions and 1 deletions
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12
Lib/test/test_dataclasses.py
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@ -7,6 +7,7 @@ from dataclasses import *
import pickle
import inspect
import builtins
import types
import unittest
from unittest.mock import Mock
from typing import ClassVar, Any, List, Union, Tuple, Dict, Generic, TypeVar, Optional, Protocol
@ -1348,6 +1349,17 @@ class TestCase(unittest.TestCase):
with self.assertRaisesRegex(TypeError, 'should be called on dataclass instances'):
replace(obj, x=0)
def test_is_dataclass_genericalias(self):
@dataclass
class A(types.GenericAlias):
origin: type
args: type
self.assertTrue(is_dataclass(A))
a = A(list, int)
self.assertTrue(is_dataclass(type(a)))
self.assertTrue(is_dataclass(a))
def test_helper_fields_with_class_instance(self):
# Check that we can call fields() on either a class or instance,
# and get back the same thing.