From 5affd23e6f42125998724787025080a24839266e Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Wed, 5 Apr 2017 09:37:24 +0300
Subject: bpo-29762: More use "raise from None". (#569)

This hides unwanted implementation details from tracebacks.
---
 Lib/sysconfig.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Lib/sysconfig.py')

diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py
index 9314e71a2f..ed0a34d662 100644
--- a/Lib/sysconfig.py
+++ b/Lib/sysconfig.py
@@ -147,7 +147,7 @@ def _subst_vars(s, local_vars):
         try:
             return s.format(**os.environ)
         except KeyError as var:
-            raise AttributeError('{%s}' % var)
+            raise AttributeError('{%s}' % var) from None
 
 def _extend_dict(target_dict, other_dict):
     target_keys = target_dict.keys()
-- 
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