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-rw-r--r--Lib/ast.py2
-rw-r--r--Lib/test/test_ast.py4
2 files changed, 5 insertions, 1 deletions
diff --git a/Lib/ast.py b/Lib/ast.py
index de3df14..4c8c779 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -346,7 +346,7 @@ class _ABC(type):
except AttributeError:
return False
else:
- return type(value) in _const_types[cls]
+ return isinstance(value, _const_types[cls])
return type.__instancecheck__(cls, inst)
def _new(cls, *args, **kwargs):
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 10be02e..4bbdc3b 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -399,6 +399,10 @@ class AST_Tests(unittest.TestCase):
self.assertFalse(isinstance(ast.Constant(), ast.NameConstant))
self.assertFalse(isinstance(ast.Constant(), ast.Ellipsis))
+ class S(str): pass
+ self.assertTrue(isinstance(ast.Constant(S('42')), ast.Str))
+ self.assertFalse(isinstance(ast.Constant(S('42')), ast.Num))
+
def test_subclasses(self):
class N(ast.Num):
def __init__(self, *args, **kwargs):