commit 5affd23e6f42125998724787025080a24839266e
author Serhiy Storchaka <storchaka@gmail.com> Wed Apr 05 09:37:24 2017 +0300
committer GitHub <noreply@github.com> Wed Apr 05 09:37:24 2017 +0300
tree 8b7ca82362e78a32805b117d574082d512251d3c
parent 43ba8861e0ad044efafa46a7cc04e12ac5df640e

bpo-29762: More use "raise from None". (#569)

This hides unwanted implementation details from tracebacks.

Lib/xml/dom/xmlbuilder.py

diff --git a/Lib/xml/dom/xmlbuilder.py b/Lib/xml/dom/xmlbuilder.py
index e9a1536..60a2bc3 100644
--- a/Lib/xml/dom/xmlbuilder.py
+++ b/Lib/xml/dom/xmlbuilder.py
@@ -80,7 +80,7 @@
                 settings = self._settings[(_name_xform(name), state)]
             except KeyError:
                 raise xml.dom.NotSupportedErr(
-                    "unsupported feature: %r" % (name,))
+                    "unsupported feature: %r" % (name,)) from None
             else:
                 for name, value in settings:
                     setattr(self._options, name, value)