From: Inada Naoki <songofacandy@gmail.com>
Date: Thu, 5 Sep 2019 04:07:08 +0000 (+0900)
Subject: bpo-38026: fix inspect.getattr_static (GH-15676)
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8f9cc8771ffb8d0e21be287eaed42ae06087acca;p=python

bpo-38026: fix inspect.getattr_static (GH-15676)

It should avoid dynamic lookup including `isinstance`.

This is a regression caused by GH-5351.
---

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 99a580bd2f..a616f2d49b 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 0000000000..166cd86751
--- /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.