From 8f9cc8771ffb8d0e21be287eaed42ae06087acca Mon Sep 17 00:00:00 2001
From: Inada Naoki <songofacandy@gmail.com>
Date: Thu, 5 Sep 2019 13:07:08 +0900
Subject: [PATCH] bpo-38026: fix inspect.getattr_static (GH-15676)

It should avoid dynamic lookup including `isinstance`.

This is a regression caused by GH-5351.
---
 Lib/inspect.py                                                | 4 ++--
 .../next/Library/2019-09-04-20-34-14.bpo-38026.0LLRX-.rst     | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2019-09-04-20-34-14.bpo-38026.0LLRX-.rst

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 99a580bd2f2350..a616f2d49b7d96 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1558,7 +1558,7 @@ def _shadowed_dict(klass):
         except KeyError:
             pass
         else:
-            if not (isinstance(class_dict, types.GetSetDescriptorType) and
+            if not (type(class_dict) is types.GetSetDescriptorType and
                     class_dict.__name__ == "__dict__" and
                     class_dict.__objclass__ is entry):
                 return class_dict
@@ -1580,7 +1580,7 @@ def getattr_static(obj, attr, default=_sentinel):
         klass = type(obj)
         dict_attr = _shadowed_dict(klass)
         if (dict_attr is _sentinel or
-            isinstance(dict_attr, types.MemberDescriptorType)):
+            type(dict_attr) is types.MemberDescriptorType):
             instance_result = _check_instance(obj, attr)
     else:
         klass = obj
diff --git a/Misc/NEWS.d/next/Library/2019-09-04-20-34-14.bpo-38026.0LLRX-.rst b/Misc/NEWS.d/next/Library/2019-09-04-20-34-14.bpo-38026.0LLRX-.rst
new file mode 100644
index 00000000000000..166cd867514cae
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-09-04-20-34-14.bpo-38026.0LLRX-.rst
@@ -0,0 +1,2 @@
+Fixed :func:`inspect.getattr_static` used ``isinstance`` while it should
+avoid dynamic lookup.