From 6015cc50bc38b9e920ce4986ee10658eaa14f561 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sun, 28 Oct 2018 13:43:03 +0200
Subject: bpo-32892: Support subclasses of base types in isinstance checks for
 AST constants. (GH-9934)

Some projects (e.g. Chameleon) create ast.Str containing an instance
of the str subclass.
---
 Lib/ast.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Lib/ast.py')

diff --git a/Lib/ast.py b/Lib/ast.py
index de3df1473e..4c8c7795ff 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):
-- 
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