From 9f696c9809cb1c9d6f4b8d2cd43dcf866825f4e3 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sat, 21 Mar 2015 22:04:42 +0200
Subject: [PATCH] Issue #23075: Whether __builtins__ is a module or a dict is
 undefined in CPython. Use the reliably well defined `import __builtin__`
 instead. Patch by Alex Gaynor.

---
 Lib/test/_mock_backport.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Lib/test/_mock_backport.py b/Lib/test/_mock_backport.py
index d3948310bba..f85becb06b5 100644
--- a/Lib/test/_mock_backport.py
+++ b/Lib/test/_mock_backport.py
@@ -24,6 +24,7 @@ __all__ = (
 __version__ = '1.0'
 
 
+import __builtin__
 import inspect
 import pprint
 import sys
@@ -32,7 +33,7 @@ from types import ModuleType
 from functools import wraps, partial
 
 
-_builtins = {name for name in __builtins__ if not name.startswith('_')}
+_builtins = {name for name in dir(__builtin__) if not name.startswith('_')}
 
 BaseExceptions = (BaseException,)
 if 'java' in sys.platform: